Re: Article on Photoshop CS4 and DeviceLink profile
Re: Article on Photoshop CS4 and DeviceLink profile
- Subject: Re: Article on Photoshop CS4 and DeviceLink profile
- From: Chris Cox <email@hidden>
- Date: Tue, 2 Dec 2008 11:22:31 -0800
- Acceptlanguage: en-US
- Thread-topic: Article on Photoshop CS4 and DeviceLink profile
Wow. Someone should have done some fact checking before sending that out.
Yes, there are a lot of corrupt multichannel profiles out there - mostly from older profile makers that didn't test interoperability. Adobe applications do check for profile validity before offering the profiles for use. So, not all of your installed multichannel profiles may show up in Photoshop - because they may not be valid profiles.
The PhotoYCC profile is interpreted correctly - but the result is YCC, displayed as a multichannel document.
There currently is no way to provide realtime previews or display of multichannel profiles with more than 4 channels - so Photoshop opted to get users the basic functionality requested (making separations) and use the existing multichannel mode. The preview during the conversion is limited by what is in the multichannel profile plus a few limitations of how Photoshop creates the preview (it could be improved, but it'll take a lot of work).
Um, yeah - most multichannel profiles don't have enough information to correctly convert back to the original data. And you're in multichannel mode without any information about the destination colorspace. The author should spend some time reading about how multichannel mode in Photoshop works (it is not a new thing).
Abstract profiles convert through the PCS. The source and destination can easily be the same profile (like the current document profile). Abstract profiles are used to "change the look" -- that's what they're for. The author seems to think they have some other purpose, but does not explain what that purpose might be.
Nothing was goofed up for device link profiles. The primary demand for them was CMYK->CMYK (for print), and RGB->RGB (for non-print folks). Adobe has a limited number of engineers, a limited number of testers, and a limited amount of time to develop and test features. Rather than delay support of device link profiles until time became available to test every possible combination of input and output color mode, Adobe focused on what was requested by the users to solve real world problems.
Also, yes, after a device link conversion document remains in the original colorspace, because currently devicelink profiles do not contain information about the destination profile so that Photoshop could assign the correct profile after applying the device link. The ICC has recently approved standards to improve the situation, but there were no samples available to test that before Photoshop shipped.
The author seems to have drawn several bad conclusions from a severe lack of knowledge, and a failure to do background research on the topic. This article is worse than useless, it is seriously misleading.
What magazine was this published in? And was it correctly labeled as advertising for basICColor?
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