On Sun, 26 Jan 2025 21:48:22 GMT, Harshitha Onkar <[email protected]> wrote:
>> src/java.desktop/share/classes/java/awt/color/ICC_Profile.java line 1155:
>>
>>> 1153: throw new IllegalArgumentException("Invalid header data");
>>> 1154: }
>>> 1155: getProfileClass(data);
>>
>> Can any of these fields have custom values (not covered by java constants
>> inside iccCStoJCS) that can still be used for color transformation?
>
> Using custom values of color space to create a new color transform (For
> instance: cmsSigMCH1Data: 0x4D434831 which is specified in LCMS API but not
> in ICC Spec) results in ProfileDataException as below. (this is expected
> since cmsSigMCH1Data constant is NOT present in JDK).
>
>
> java.awt.color.ProfileDataException: invalid ICC color space
> at
> java.desktop/java.awt.color.ICC_Profile.getNumComponents(ICC_Profile.java:1217)
> at
> java.desktop/sun.java2d.cmm.lcms.LCMSTransform.<init>(LCMSTransform.java:85)
> at java.desktop/sun.java2d.cmm.lcms.LCMS.createTransform(LCMS.java:132)
> at
> java.desktop/java.awt.color.ICC_ColorSpace.toRGB(ICC_ColorSpace.java:212)
>
>
> To summarize:
> - Profile/Device class - constants match (in ICC Spec doc and LCMS API doc)
> - Color Space - constants differ
> - Rendering Intent - constants differ
> - PCS - constants differ. This is dependent on type of device class and takes
> color space values.
> No, we definitely don't need to add any custom values to the Java API, the
> question is whether we need to reject them or not, since the ICC
> specification allows it(?).
Is this question applicable only for Rendering Intent or other fields too?
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PR Review Comment: https://git.openjdk.org/jdk/pull/23044#discussion_r1930905654
