diff options
Diffstat (limited to 'plugins/AdvaImg/src/LibJPEG/usage.txt')
| -rw-r--r-- | plugins/AdvaImg/src/LibJPEG/usage.txt | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/plugins/AdvaImg/src/LibJPEG/usage.txt b/plugins/AdvaImg/src/LibJPEG/usage.txt index c91ddff288..c8ea77cd26 100644 --- a/plugins/AdvaImg/src/LibJPEG/usage.txt +++ b/plugins/AdvaImg/src/LibJPEG/usage.txt @@ -80,8 +80,9 @@ The basic command line switches for cjpeg are: -rgb Create RGB JPEG file.
Using this switch suppresses the conversion from RGB
colorspace input to the default YCbCr JPEG colorspace.
- Use this switch in combination with the -block N
- switch (see below) for lossless JPEG coding.
+ You can use this switch in combination with the
+ -block N switch (see below) for lossless JPEG coding.
+ See also the -rgb1 switch below.
-optimize Perform optimization of entropy encoding parameters.
Without this, default encoding parameters are used.
@@ -175,6 +176,18 @@ Switches for advanced users: decoders will be unable to view a SmartScale extended
JPEG file at all.
+ -rgb1 Create RGB JPEG file with reversible color transform.
+ Works like the -rgb switch (see above) and inserts a
+ simple reversible color transform into the processing
+ which significantly improves the compression.
+ Use this switch in combination with the -block N
+ switch (see above) for lossless JPEG coding.
+ CAUTION: A decoder with inverse color transform
+ support is required for this feature. Reversible
+ color transform support is not yet widely implemented,
+ so many decoders will be unable to view a reversible
+ color transformed JPEG file at all.
+
-dct int Use integer DCT method (default).
-dct fast Use fast integer DCT (less accurate).
-dct float Use floating-point DCT method.
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