Am 30.07.06, 15:50 -0500 schrieb Paul Miller:
> Kai-Uwe Behrmann wrote:
> >> Do I need to do a transform on LOAD to get the image into some common
> >> working space (like sRGB), then another transform at display time to
> >> integrate the desired output profile? If the image contains an ICC
> >> profile, should I transform from that profile to the "working" profile?
> >> What happens if there is no embedded profile?
> >
> > The behaviour depends on the user settings in the colour management system
> > of the OS. On osX beeing it ColorSync for Windows ICM. For Linux / BSD
> > there is still nothing distributed by default. For the later you could
> > implement yourself a dialog allowing users to do the settings.
>
> Lets say I load a JPEG with an embedded profile. Do I transform FROM
> that profile to another one before I do any manipulation to the image,
> or is it safe to leave the data "as is" read from the file until I'm
> ready to DISPLAY the image, then transform from the JPEG's profile to
> the user-selected profile (ie. Adobe sRGB, Apple RGB, ColorMatch, etc)?
A editor/viewer would leave the numbers as is, until a manipulation is
wanted. This would be a nice feature.
Then ask the system (OS level color management, not lcms) if
the user opted to to work on any colour space -> leave the numbers,
the user opted to convert to editing (working) space -> check for
difference of image colour space to editing colour space -> convert to
editing colour space
the user opted to been queried -> promt for profile selection
The old or new image profile and the display profile are used to
transform colours from the image buffer into the display buffer.
> The same goes for a JPEG WITHOUT an embedded profile. How/when does it
> get transformed? Do I just create a "null" transform for it?
Select the user prefered default profile.
> I've already written code to extract an embedded profile from a JPEG,
> and I have a menu for selecting the desired display profile. I just need
> to know where to do the actual transform.
>
> --
> Paul Miller | [EMAIL PROTECTED] | www.fxtech.com | Got Tivo?
Look at applications like Adobe CS, Scribus or CinePaint how they
behave and design the dialogs. Later provide source code.
regards
Kai-Uwe Behrmann
+ development for color management
+ imaging / panoramas
+ email: [EMAIL PROTECTED]
+ http://www.behrmann.name
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