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| author | Allan Sandfeld Jensen <allan.jensen@theqtcompany.com> | 2016-06-08 12:30:08 +0200 |
|---|---|---|
| committer | Allan Sandfeld Jensen <allan.jensen@qt.io> | 2016-06-15 08:16:52 +0000 |
| commit | 4e25236729caf1947ddcdfb51f17252ff863d9bf (patch) | |
| tree | a20ec1f1fde1513bdb69c4c97c2b7d4adf2c40a5 /src | |
| parent | 3c08a8365a7dede06620819a859f8ed93792d4e6 (diff) | |
| download | qtimageformats-4e25236729caf1947ddcdfb51f17252ff863d9bf.tar.gz | |
Use LZW compression on 1- and 8-bit formats
The documentation says we use LZW, and LZW both works and produces
smaller results, so it would make sense to follow our documentation.
This also fixes a problem with some readers having trouble with the
CCITTRLE compressions.
Task-number: QTBUG-53774
Change-Id: Ie2d179279a4ce65d8578c037ad59cc37ca854825
Reviewed-by: Ivan Komissarov <ABBAPOH@gmail.com>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/plugins/imageformats/tiff/qtiffhandler.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/plugins/imageformats/tiff/qtiffhandler.cpp b/src/plugins/imageformats/tiff/qtiffhandler.cpp index f72c2a0..6fcf2a7 100644 --- a/src/plugins/imageformats/tiff/qtiffhandler.cpp +++ b/src/plugins/imageformats/tiff/qtiffhandler.cpp @@ -541,7 +541,7 @@ bool QTiffHandler::write(const QImage &image) if (image.colorTable().at(0) == 0xffffffff) photometric = PHOTOMETRIC_MINISWHITE; if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, photometric) - || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_CCITTRLE) + || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_LZW) || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 1)) { TIFFClose(tiff); return false; @@ -576,14 +576,14 @@ bool QTiffHandler::write(const QImage &image) if (colorTable.at(0) == 0xffffffff) photometric = PHOTOMETRIC_MINISWHITE; if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, photometric) - || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS) + || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_LZW) || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 8)) { TIFFClose(tiff); return false; } } else { if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE) - || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS) + || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_LZW) || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 8)) { TIFFClose(tiff); return false; |