gwlucastrig commented on a change in pull request #106:
URL: https://github.com/apache/commons-imaging/pull/106#discussion_r522424325
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File path:
src/main/java/org/apache/commons/imaging/formats/tiff/constants/TiffTagConstants.java
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@@ -347,6 +347,8 @@
public static final TagInfoShorts TIFF_TAG_EXTRA_SAMPLES = new
TagInfoShorts(
"ExtraSamples", 0x152, -1,
TiffDirectoryType.TIFF_DIRECTORY_ROOT);
+ public static final int EXTRA_SAMPLE_ASSOCIATED_ALPHA = 1;
+ public static final int EXTRA_SAMPLE_UNASSOCIATED_ALPHA = 2;
Review comment:
Associated and Unassociated are the names they use in the TIFF
specification. In playing with the Java BufferedImage class, there seems to be
a bias toward unassociated alpha (non-pre-multiplied). For example, at least
in the OpenJDK Java I use, if you have a pre-multiplied images and call getRGB
on it, the pixel values that come back are adjusted to look like
non-pre-multiplied.
Not sure I answered your question here.... Sorry.
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