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7 Commits

Author SHA1 Message Date
Nigel Tao
a1da419f1a go.image/tiff: fix (TIFF-specific) LZW decompression. 
The blue-purple-pink.lzwcompressed.tiff image was created by
"bmp2tiff -c lzw".

LGTM=djd
R=djd
CC=bsiegert, golang-codereviews
https://golang.org/cl/105750045
 2014-06-02 14:51:51 +10:00
Patrick Riley
38c1f4ffe8 go.image/tiff: Support missing Compression tag 
no_compress.tiff is no_rps.tiff that was read in by go.image/tiff and written out again (with a hack to avoid creating the Compression tag on the way out).

$ tiffdump no_compress.tiff
no_compress.tiff:
Magic: 0x4949 <little-endian> Version: 0x2a
Directory 0: offset 968 (0x3c8) next 0 (0)
ImageWidth (256) SHORT (3) 1<16>
ImageLength (257) SHORT (3) 1<15>
BitsPerSample (258) SHORT (3) 4<8 8 8 8>
Photometric (262) SHORT (3) 1<2>
StripOffsets (273) LONG (4) 1<8>
SamplesPerPixel (277) SHORT (3) 1<4>
RowsPerStrip (278) SHORT (3) 1<15>
StripByteCounts (279) LONG (4) 1<960>
XResolution (282) RATIONAL (5) 1<72>
YResolution (283) RATIONAL (5) 1<72>
ResolutionUnit (296) SHORT (3) 1<2>
ExtraSamples (338) SHORT (3) 1<2>

LGTM=bsiegert, nigeltao
R=bsiegert, nigeltao
CC=golang-codereviews
https://golang.org/cl/95930044
 2014-05-12 16:41:44 +10:00
ChaiShushan
b2d744f611 go.image/tiff: support 16bit RGB 
R=nigeltao, bsiegert
CC=golang-dev
https://golang.org/cl/13736044
 2013-09-18 17:16:05 +10:00
ChaiShushan
de306d5329 go.image/tiff: decoder support tiled tiff format 
Use these commands to generate testdata:
tiffcp -s -r 64 video-001.tiff video-001-strip-64.tiff
tiffcp -t -l 64 -w 64 video-001.tiff video-001-tile-64x64.tiff

R=golang-dev, nigeltao, bsiegert
CC=golang-dev
https://golang.org/cl/13453043
 2013-09-06 20:07:58 +10:00
Benny Siegert
c35a1ecb6c go.image/tiff: use optimized routines for RGBA and NRGBA 
Performance for an RGBA image:

benchmark          old ns/op    new ns/op    delta
BenchmarkEncode      1633495         7897  -99.52%

benchmark           old MB/s     new MB/s  speedup
BenchmarkEncode        37.83      7824.96  206.85x

NRGBA images are now encoded as such, the spec calls it
"unassociated alpha".

R=nigeltao, rsc
CC=golang-dev
https://golang.org/cl/6308049
 2012-06-13 10:40:38 +10:00
Nigel Tao
996c335c4a go.image/{bmp,tiff}: move tiff/testdata to testdata. 
Add a "compare to golden PNG" test for BMP and TIFF.

R=rsc
CC=golang-dev
https://golang.org/cl/5601054
 2012-01-31 14:02:27 +11:00
Nigel Tao
cc3e6234e7 go.image: initial code. 
Manual edits to README.
Moved from main Go repository, deleted Makefiles.

Tested with go test code.google.com/p/go.image/...

Fixes golang/go#2797.

R=rsc, rsc, r
CC=golang-dev
https://golang.org/cl/5593053
 2012-01-31 11:32:50 +11:00