August 2008 - Pro-apps-dev - lists.apple.com

Re: Getting 32 bit float image format instead of 16 bit
by Paul Miller 08 Aug '08

08 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.16 (Windows/20080708) -- Paul Miller | paul(a)fxtech.com | www.fxtech.com | Got Tivo? _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… Brad Wright wrote: Is there any way to avoid getting 16 bit float the input image format for renderOutput. I'm having to write image processing loops for 32 bit, 16 bit, and 8 bit, for both RGB and YUV. This comes out to 6 different loops for all the formats, as I'm trying to avoid extra processing inside each loop for speed. That's a lot of redundant code all doing the same general thing. I'd like to skip supporting 16 bit and just support 32 bit, if I could prevent Final Cut from sending me 16 bit images. Is this at all possible? I just want 8 bit integer or 32 bit float. You should look into template-izing your code (assuming you are using C++). Turn all those loops into one loop. This email sent to site_archiver(a)lists.apple.com

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Re: Getting 32 bit float image format instead of 16 bit
by Paul Schneider 08 Aug '08

08 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Hi Brad, - Paul On Aug 8, 2008, at 12:11 PM, Brad Wright wrote: Hi ProApps: Brad Wright _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/pschneider%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… Final Cut will never give you 16-bit images. Motion will only send you 16-bit textures, never 16-bit bitmaps. Is there any way to avoid getting 16 bit float the input image format for renderOutput. I'm having to write image processing loops for 32 bit, 16 bit, and 8 bit, for both RGB and YUV. This comes out to 6 different loops for all the formats, as I'm trying to avoid extra processing inside each loop for speed. That's a lot of redundant code all doing the same general thing. I'd like to skip supporting 16 bit and just support 32 bit, if I could prevent Final Cut from sending me 16 bit images. Is this at all possible? I just want 8 bit integer or 32 bit float. This email sent to pschneider(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Getting 32 bit float image format instead of 16 bit
by Brad Wright 08 Aug '08

08 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Hi ProApps: Brad Wright _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… Is there any way to avoid getting 16 bit float the input image format for renderOutput. I'm having to write image processing loops for 32 bit, 16 bit, and 8 bit, for both RGB and YUV. This comes out to 6 different loops for all the formats, as I'm trying to avoid extra processing inside each loop for speed. That's a lot of redundant code all doing the same general thing. I'd like to skip supporting 16 bit and just support 32 bit, if I could prevent Final Cut from sending me 16 bit images. Is this at all possible? I just want 8 bit integer or 32 bit float. This email sent to site_archiver(a)lists.apple.com

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Re: Final Cut Pro and Final Cut Express XML formats
by Andreas Kiel 06 Aug '08

06 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Simon, Regards Andreas On 06.08.2008, at 12:33, Simon Hargreaves wrote: Thanks, Simon... Hi SImon, Andreas On 06.08.2008, at 11:35, Simon Hargreaves wrote: Simon... Hi folks, Best Luck, Helnea On Aug 5, 2008, at 6:38 AM, Simon Hargreaves wrote: Simon... Andreas On 05.08.2008, at 14:36, Simon Hargreaves wrote: Andreas Kiel Spherico Nelkenstr. 25 D-76135 Karlsruhe Tel.: +49 (0)721 183 9753 eFax: +1 650 897 8094 eMail: kiel(a)spherico.com http://spherico.com/filmtools -- workflow tools for FCP P Please don't print this e-mail unless you really need to. Andreas Kiel Spherico Nelkenstr. 25 D-76135 Karlsruhe Tel.: +49 (0)721 183 9753 eFax: +1 650 897 8094 eMail: kiel(a)spherico.com http://spherico.com/filmtools -- workflow tools for FCP P Please don't print this e-mail unless you really need to. _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… As said FCE HD can read FCP XMLs, FCP can read FCE documents. It's difficult to discuss such a theme if you don't have access to both of the apps. I can't help there. The problem is that I'm working on a workflow proposal. I don't actually have a copy of FCE to experiment with, so before I recommend for people to spend money I want to have some idea that it will work. I have a group of people that I collaborate with who currently have iMacs/iBooks and as such can't run Final Cut Studio as they're not up to spec, they can however run FCE, and for simple timeline editing that's all they need. However interoperability between FCE and FCP is obviously a problem, which is why it would be nice to able to export out of FCP something they could read. Andreas Kiel wrote: Haven't you tried to "force open" the FCP XML with FCE, it used to work, I don't have this machine with FCE anymore (the version was FCE HD) but that worked fine. You should probably use XML version 2 with your FCP export. For the other way round (FCE to FCP) you don't need XML. >From what I know the iMovie exported XML is the FCP XML interchange format, so I'm not sure what the problem is. Due to the difference in functionality between FCP and FCE there obviously won't be complete support for all the features, but for shared functionality this shouldn't be a problem. Helena Ju wrote: There is no XML support in FCE except for iMovie exported XML. You can however, open any FCE project in FCP. It really isn't meant to go the other way. It would seem that a plugin for FCE that could export FCP XML would be very beneficial and not that difficult to do, is there anyone working on something like this? Or is this something that Apple may be planning for a future FCE release, it would fit with their policy of interoperability between the products. What do you mean by long version? Do you mean not supporting nested sequences? Andreas Kiel wrote: You can't export XML out of FCE, but FCP can open FCE files. FCE does not officially import XML, but you can drag a XML to the FCE program icon and it will import the XML as long version and used effects etc will match. I'm interested in the compatibility between the project/ timeline formats of Final Cut Express and Final Cut Pro. If they are both XML is it possible to share the files between the two applications and if not is there a simple conversion tool (Bi-directional)? I'm not talking about sophisticated LiveType or Motion functionality, just basic timeline editing with simple common filters and transitions. As I'm aware that there are some functional differences between the two applications. Thanks, Simon... _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/ andreas.kiel%40spherico.com This email sent to andreas.kiel(a)spherico.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/hju% 40apple.com This email sent to hju(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Final Cut Pro and Final Cut Express XML formats
by Simon Hargreaves 06 Aug '08

06 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.16 (Macintosh/20080707) Thanks, Simon... Hi SImon, Andreas On 06.08.2008, at 11:35, Simon Hargreaves wrote: Simon... Hi folks, Best Luck, Helnea On Aug 5, 2008, at 6:38 AM, Simon Hargreaves wrote: Simon... Andreas On 05.08.2008, at 14:36, Simon Hargreaves wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/hju%40apple.com Andreas Kiel Spherico Nelkenstr. 25 D-76135 Karlsruhe Tel.: +49 (0)721 183 9753 eFax: +1 650 897 8094 eMail: kiel(a)spherico.com http://spherico.com/filmtools -- workflow tools for FCP P Please don't print this e-mail unless you really need to. _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… The problem is that I'm working on a workflow proposal. I don't actually have a copy of FCE to experiment with, so before I recommend for people to spend money I want to have some idea that it will work. I have a group of people that I collaborate with who currently have iMacs/iBooks and as such can't run Final Cut Studio as they're not up to spec, they can however run FCE, and for simple timeline editing that's all they need. However interoperability between FCE and FCP is obviously a problem, which is why it would be nice to able to export out of FCP something they could read. Andreas Kiel wrote: Haven't you tried to "force open" the FCP XML with FCE, it used to work, I don't have this machine with FCE anymore (the version was FCE HD) but that worked fine. You should probably use XML version 2 with your FCP export. For the other way round (FCE to FCP) you don't need XML. >From what I know the iMovie exported XML is the FCP XML interchange format, so I'm not sure what the problem is. Due to the difference in functionality between FCP and FCE there obviously won't be complete support for all the features, but for shared functionality this shouldn't be a problem. Helena Ju wrote: There is no XML support in FCE except for iMovie exported XML. You can however, open any FCE project in FCP. It really isn't meant to go the other way. It would seem that a plugin for FCE that could export FCP XML would be very beneficial and not that difficult to do, is there anyone working on something like this? Or is this something that Apple may be planning for a future FCE release, it would fit with their policy of interoperability between the products. What do you mean by long version? Do you mean not supporting nested sequences? Andreas Kiel wrote: You can't export XML out of FCE, but FCP can open FCE files. FCE does not officially import XML, but you can drag a XML to the FCE program icon and it will import the XML as long version and used effects etc will match. I'm interested in the compatibility between the project/timeline formats of Final Cut Express and Final Cut Pro. If they are both XML is it possible to share the files between the two applications and if not is there a simple conversion tool (Bi-directional)? I'm not talking about sophisticated LiveType or Motion functionality, just basic timeline editing with simple common filters and transitions. As I'm aware that there are some functional differences between the two applications. Thanks, Simon... _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/andreas.kiel%40spherico… This email sent to andreas.kiel(a)spherico.com This email sent to hju(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Final Cut Pro and Final Cut Express XML formats
by Andreas Kiel 06 Aug '08

06 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Hi SImon, Andreas On 06.08.2008, at 11:35, Simon Hargreaves wrote: Simon... Hi folks, Best Luck, Helnea On Aug 5, 2008, at 6:38 AM, Simon Hargreaves wrote: Simon... Andreas On 05.08.2008, at 14:36, Simon Hargreaves wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/hju%40apple.com Andreas Kiel Spherico Nelkenstr. 25 D-76135 Karlsruhe Tel.: +49 (0)721 183 9753 eFax: +1 650 897 8094 eMail: kiel(a)spherico.com http://spherico.com/filmtools -- workflow tools for FCP P Please don't print this e-mail unless you really need to. _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… Haven't you tried to "force open" the FCP XML with FCE, it used to work, I don't have this machine with FCE anymore (the version was FCE HD) but that worked fine. You should probably use XML version 2 with your FCP export. For the other way round (FCE to FCP) you don't need XML. >From what I know the iMovie exported XML is the FCP XML interchange format, so I'm not sure what the problem is. Due to the difference in functionality between FCP and FCE there obviously won't be complete support for all the features, but for shared functionality this shouldn't be a problem. Helena Ju wrote: There is no XML support in FCE except for iMovie exported XML. You can however, open any FCE project in FCP. It really isn't meant to go the other way. It would seem that a plugin for FCE that could export FCP XML would be very beneficial and not that difficult to do, is there anyone working on something like this? Or is this something that Apple may be planning for a future FCE release, it would fit with their policy of interoperability between the products. What do you mean by long version? Do you mean not supporting nested sequences? Andreas Kiel wrote: You can't export XML out of FCE, but FCP can open FCE files. FCE does not officially import XML, but you can drag a XML to the FCE program icon and it will import the XML as long version and used effects etc will match. I'm interested in the compatibility between the project/ timeline formats of Final Cut Express and Final Cut Pro. If they are both XML is it possible to share the files between the two applications and if not is there a simple conversion tool (Bi-directional)? I'm not talking about sophisticated LiveType or Motion functionality, just basic timeline editing with simple common filters and transitions. As I'm aware that there are some functional differences between the two applications. Thanks, Simon... _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/andreas.kiel %40spherico.com This email sent to andreas.kiel(a)spherico.com This email sent to hju(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Final Cut Pro and Final Cut Express XML formats
by Simon Hargreaves 06 Aug '08

06 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.16 (Macintosh/20080707) Simon... Hi folks, Best Luck, Helnea On Aug 5, 2008, at 6:38 AM, Simon Hargreaves wrote: Simon... Andreas On 05.08.2008, at 14:36, Simon Hargreaves wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/hju%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… >From what I know the iMovie exported XML is the FCP XML interchange format, so I'm not sure what the problem is. Due to the difference in functionality between FCP and FCE there obviously won't be complete support for all the features, but for shared functionality this shouldn't be a problem. Helena Ju wrote: There is no XML support in FCE except for iMovie exported XML. You can however, open any FCE project in FCP. It really isn't meant to go the other way. It would seem that a plugin for FCE that could export FCP XML would be very beneficial and not that difficult to do, is there anyone working on something like this? Or is this something that Apple may be planning for a future FCE release, it would fit with their policy of interoperability between the products. What do you mean by long version? Do you mean not supporting nested sequences? Andreas Kiel wrote: You can't export XML out of FCE, but FCP can open FCE files. FCE does not officially import XML, but you can drag a XML to the FCE program icon and it will import the XML as long version and used effects etc will match. I'm interested in the compatibility between the project/timeline formats of Final Cut Express and Final Cut Pro. If they are both XML is it possible to share the files between the two applications and if not is there a simple conversion tool (Bi-directional)? I'm not talking about sophisticated LiveType or Motion functionality, just basic timeline editing with simple common filters and transitions. As I'm aware that there are some functional differences between the two applications. Thanks, Simon... _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/andreas.kiel%40spherico… This email sent to andreas.kiel(a)spherico.com This email sent to hju(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Preventing fcp from switching back to rgb
by Brad Wright 05 Aug '08

05 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com It's too bad there's no way to lock to 32 bit YUV. On Aug 5, 2008, at 9:50 AM, Paul Schneider <pschneider(a)apple.com> wrote: Hi Brad, The short answer is no, you can't. - Paul On Aug 5, 2008, at 11:34 AM, Brad Wright wrote: Brad Wright _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/pschneider%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… >From as far as I can tell even with all the render setting set to YUV, it still switches to rgb on render. The timeline only contains YUV video. My initial problem with RGB is that I found color shifts when trying to use it inside another plugin that I wrote. It's also really expensive, because of the need to work with 16 or 32 bit float and convert back to YUV. The long answer is that this is controlled by the user. See the Video Tab in the Sequence Settings dialog. By default it is set to "Render YUV material in 8-bit YUV", but the user can override this to render everything in RGB. Note that YUV-ness is also dependent on your footage format (and output format). Almost all users are working with YUV footage, but many plugin developers test with RGB media such as Tiff images or RGB movies compressed with the Animation codec. We won't render in YUV if your input and output are RGB. Your output format is controlled by your sequence's codec. Check out the FCP manual for more information. I'd definitely recommend doing your initial testing with DV-NSTC media and sequences created using the DV-NTSC preset, and then moving on to handle other cases from there. If you're working in YUV, you should definitely test with both 601 and 709 media. Also keep in mind that while practically all consumer cameras generate YUV footage, some high-end cameras are starting to be natively RGB, and this trend is likely to continue and work its way to the more affordable end of the market in the future. Finally, I'd recommend reading the "Rendering FxPlugs in Final Cut" document if you haven't already. Rendering in Final Cut is fairly complicated, and seemingly innocuous changes can change the way we call your plugin. I don't know if it's possible, but I'd like to lock final cut pro into only using YUV fximages. Currently, during previewing in the timeline I get YUV, but when I try render out, final cut seems to switch into rgb fximages. Is there any way to lock it YUV? This email sent to pschneider(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Final Cut Pro and Final Cut Express XML formats
by Helena Ju 05 Aug '08

05 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Hi folks, Best Luck, Helnea On Aug 5, 2008, at 6:38 AM, Simon Hargreaves wrote: Simon... Andreas On 05.08.2008, at 14:36, Simon Hargreaves wrote: Thanks, Simon... _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/andreas.kiel%40spherico… _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/hju%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… There is no XML support in FCE except for iMovie exported XML. You can however, open any FCE project in FCP. It really isn't meant to go the other way. It would seem that a plugin for FCE that could export FCP XML would be very beneficial and not that difficult to do, is there anyone working on something like this? Or is this something that Apple may be planning for a future FCE release, it would fit with their policy of interoperability between the products. What do you mean by long version? Do you mean not supporting nested sequences? Andreas Kiel wrote: You can't export XML out of FCE, but FCP can open FCE files. FCE does not officially import XML, but you can drag a XML to the FCE program icon and it will import the XML as long version and used effects etc will match. I'm interested in the compatibility between the project/timeline formats of Final Cut Express and Final Cut Pro. If they are both XML is it possible to share the files between the two applications and if not is there a simple conversion tool (Bi-directional)? I'm not talking about sophisticated LiveType or Motion functionality, just basic timeline editing with simple common filters and transitions. As I'm aware that there are some functional differences between the two applications. This email sent to andreas.kiel(a)spherico.com This email sent to hju(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: YCbCr continued
by Paul Schneider 05 Aug '08

05 Aug '08

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com - Paul On Aug 5, 2008, at 11:50 AM, Brad Wright wrote: Brad Wright On Aug 5, 2008, at 9:15 AM, Darrin Cardani <dcardani(a)apple.com> wrote: On Aug 4, 2008, at 3:23 PM, Brad Wright wrote: Hi Pro Apps Team: Zero Saturation point 112 Maximum Cb and Cr value of 255 112/255 = .43921569 approximately .439 Darrin -- Darrin Cardani dcardani(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/pschneider%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.a… The only way I could see this happens is if core image is somehow apply a color transform before my shader is activated and the reversing it back out before it gets displayed. That's typically what happens. CI has a processing colorspace and an output colorspace. Your inputs are converted to the processing space, the kernels are run, and then the result is converted to the output space. Make sure that all the spaces are tagged the same to avoid conversion. Also, you probably don't want to use the "DisplayRGB" colorspace, since that is calibrated to your monitor. GenericRGB is probably more what you want. I'll try that. I don't know how to work with ARB shaders, but I'll see what I can do. I think the color is set up correctly, as there is no shift in color when I write the ciimage which I took from the FxTexture that was passed in to the pluggin. I tried creating a ciimage from retrieved YUV data from the same frame, and I didn't notice any color shift. Is there any known problems with using CIImages that could cause a color shift? The only way I could see this happens is if core image is somehow apply a color transform before my shader is activated and the reversing it back out before it gets displayed. Here's what I did. I created a core image filter that generates a color that fills the entire screen. All this filter does is display what ever values you feed into it for the vec4 color that is returned (pre-multiplied of course). I then used the built in Final Cut Scopes to read the color values back. It appears that the color neutral point is when both U and V are at 0.42 - 0.44 depending on the value for Y. At least that's what the Final Cut Scopes are saying. I looked at both the RGB parade and the Vectorscope to verify that these values line up. I'm apply this filter directly over a video frame from an FxTexture mapped into a CIImage. I've been through the documentation and I can't figure out how Final Cut is mapping these values. The U and V values should stay color neutral while the Y value varies up or down. I'm not seeing that happening. It appears the Hue is being shifted around as the Y varies. I'm not sure how the U and V values arrive at between 0.42 and 0.44. The best I can figure is that Cb and Cr are mapped at between 0 - 224 without the offset that the documentation says there is. If I assume that the color neutral point is .42-0.44 in float point, then I can get this value by mapping: Does anyone know why this would happen? Brad, Is it possible that you're not setting up Core Image's color space correctly? What happens when you try the same thing in a straight OpenGL ARB Fragment program with no Core Image involved? Do you see the same problems? This email sent to pschneider(a)apple.com This email sent to site_archiver(a)lists.apple.com

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