Re: Color Management for iPad?
Re: Color Management for iPad?
- Subject: Re: Color Management for iPad?
- From: Stéphane Beaudry <email@hidden>
- Date: Sun, 31 Jul 2011 16:15:19 -0400
Greetings,
I have worked as a developer for color management applications for over 6 years (Windows & MacOS) but I have spent the last two years and half as a mobile developer (iOS, Android and Blackberry) for other fields of application. When I first started on the iPhone, I tried out of curiosity to see how well color management was supported on it. Of course, it wasn't. At all.
As of iOS 4.3, there is still no general color management support, no matter what the Quartz API promises. The whole ColorSync API is also missing from the iOS.
Some portfolio viewing applications advise their users to save the images using the sRGB color space since they claim it is the closest match for the iPad's native color space. Of course, this is not satisfactory for a useful preview. Also, it would be very interesting to get additional information from the image such as matching tolerances, switching between rendering intents, etc.
There are indeed ways to build an iPad application which performs the tasks of reading profiles and performing the proper conversions for images. The iOS frameworks do provide useful tools to edit even large files efficiently. Communicating between desktop and mobile applications has never been easier and may even get better when iOS 5 gets released. In short, there is a lot developers can already do to create interesting applications related to color management. It is quite challenging because mobile frameworks are still struggling to grow up (just take a look at Bluetooth on the iPad) but it is not impossible.
Stéphane Beaudry
Lead Developer / Mobile Applications
Innobec Technologies Inc.
Le 2011-07-30 à 16:52, Jan-Peter Homann a écrit :
> Hello to all,
> I just subscribed to the colorsync developers list to ask some questions.
> It may helps if other people also subscribe and state, that they are interested for an answer.
>
> Jan-Peter
>
> ******
> Following questions I have sent
> *******
>
> Hello to all,
>
> The iOS documentation states, that ICC-profiles should be supported through Quartz.
>
> But user tests have shown, that currently no Apple iOS application for iPad seems to support ICC-profiles.
>
> Is this a problem of the current Apple applications or are there differences in Quartz ICC-profile support between iOS and Mac OS X, which are not mentioned in the official documentation ?
>
> I´m also interested on:
> - does iOS 4 provides a color characterization / profile for the display ?
> - If yes, is this an ICC-profile or an internal format because of speed optimization ?
> - if yes, is there any documentation about it ?
> - if yes, is this hardcoded, or can a developer change the display color characterization / profile ?
>
> Thanks and best regards
> Jan-Peter
>
>
>
> Am 30.07.11 18:54, schrieb Louis Dery:
>> In order to validate that ICC profiles are not used in iOS4 basic apps like "Mail" (and "Photos"), just send to yourself an e-mail with picture with two different ICC profile embedded…
>> one with Adobe RGB and a copy of this picture with a different ICC profile embedded (assigned) like ProPhoto RGB.
>> You will see in Mail (on the iPad) that they look the same! Check this e-mail on you Mac with "Mail" app and will see that they are different!
>>
>>
>> Hope this is more clear when I mentioned that color management is not implemented in iOS4, like it is on Mac OS X.
>>
>> Louis Dery
>> www.couleur911.com _______________________________________________
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