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Now preserves PHOTOMETRIC_WHITE_IS_ZERO for CCITT encodings.

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This commit is contained in:
Harald Kuhr 2018-08-18 12:51:03 +02:00
parent 44530d4717
commit dd914444c9
1 changed files with 16 additions and 4 deletions
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20
imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageReader.java
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@ -461,7 +461,16 @@ public final class TIFFImageReader extends ImageReaderBase {
// TIFF 6.0 baseline
case TIFFBaseline.PHOTOMETRIC_WHITE_IS_ZERO:
// WhiteIsZero
// NOTE: We handle this by inverting the values when reading, as Java has no ColorModel that easily supports this.
// We need special case to preserve WhiteIsZero for CCITT 1 bit encodings
// as some software will treat black/white runs as-is, regardless of photometric.
// Special handling is also in the normalizeColor method
if (profile == null && significantSamples == 1 && bitsPerSample == 1) {
byte[] lut = new byte[] {-1, 0};
return ImageTypeSpecifier.createIndexed(lut, lut, lut, null, bitsPerSample, dataType);
}
// Otherwise, we'll handle this by inverting the values when reading
case TIFFBaseline.PHOTOMETRIC_BLACK_IS_ZERO:
// BlackIsZero
// Gray scale or B/W
@ -2042,9 +2051,12 @@ public final class TIFFImageReader extends ImageReaderBase {
private void normalizeColor(int photometricInterpretation, byte[] data) throws IIOException {
switch (photometricInterpretation) {
case TIFFBaseline.PHOTOMETRIC_WHITE_IS_ZERO:
// Inverse values
for (int i = 0; i < data.length; i++) {
data[i] ^= -1;
// NOTE: Preserve WhiteIsZero for 1 bit monochrome, for CCITT compatibility
if (getBitsPerSample() > 1 || getValueAsIntWithDefault(TIFF.TAG_SAMPLES_PER_PIXEL, 1) > 1) {
// Inverse values
for (int i = 0; i < data.length; i++) {
data[i] ^= -1;
}
}
break;