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ef5e0288ce
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11 Commits

Author SHA1 Message Date
Nigel Tao
ef5e0288ce go.image/webp: implement lossy-with-alpha. 
This fixes all three lossy_alpha*.webp conformance tests.

The test data was generated by cwebp/dwebp version 0.4.1:
cwebp yellow_rose.png -o yellow_rose.lossy-with-alpha.webp
dwebp yellow_rose.lossy-with-alpha.webp -pgm -o tmp.pgm
convert tmp.pgm yellow_rose.lossy-with-alpha.webp.nycbcra.png

LGTM=pascal.massimino, r
R=r, pascal.massimino
CC=golang-codereviews
https://golang.org/cl/154350043
 2014-10-20 10:46:12 +11:00
Nigel Tao
8d4fc1653b go.image/bmp: add a test image for top-down BMPs. 
LGTM=ruiu
R=ruiu
CC=bsiegert, golang-codereviews
https://golang.org/cl/149090043
 2014-10-01 09:41:12 +10:00
Nigel Tao
07fcf9c2fe vp8: skip filtering for all-zero-DC macroblock residuals. 
This makes the Go code match the libwebp C code's output on
blue-purple-pink-large.*-filter.lossy.webp

Also make the various WEBP benchmarks all decode a similar image,
the image at http://blog.golang.org/gophercon/image01.jpg, to make
it more meaningful to e.g. compare the simple filter's numbers with
the normal filter's numbers.

Also fix a "go vet" warning in webp/decode.go.

The test data was generated by:
wget http://blog.golang.org/gophercon/image01.jpg -O blue-purple-pink-large.jpeg
convert blue-purple-pink-large.jpeg blue-purple-pink-large.png
cwebp -lossless blue-purple-pink-large.png -o blue-purple-pink-large.lossless.webp
cwebp -q 80 -f 0 blue-purple-pink-large.png -o blue-purple-pink-large.no-filter.lossy.webp
cwebp -q 80 -strong blue-purple-pink-large.png -o blue-purple-pink-large.normal-filter.lossy.webp
cwebp -q 80 -nostrong blue-purple-pink-large.png -o blue-purple-pink-large.simple-filter.lossy.webp
dwebp -pgm blue-purple-pink-large.no-filter.lossy.webp -o tmp.pgm && convert tmp.pgm blue-purple-pink-large.no-filter.lossy.webp.ycbcr.png && rm tmp.pgm
dwebp -pgm blue-purple-pink-large.normal-filter.lossy.webp -o tmp.pgm && convert tmp.pgm blue-purple-pink-large.normal-filter.lossy.webp.ycbcr.png && rm tmp.pgm
dwebp -pgm blue-purple-pink-large.simple-filter.lossy.webp -o tmp.pgm && convert tmp.pgm blue-purple-pink-large.simple-filter.lossy.webp.ycbcr.png && rm tmp.pgm

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/106230044
 2014-06-30 10:36:25 +10:00
Nigel Tao
0424e74a0e go.image/vp8: implement the normal filter. 
The testdata was generated via:
cwebp foo.png -o foo.lossy.webp
dwebp -pgm foo.lossy.webp -o tmp.pgm
convert tmp.pgm foo.lossy.webp.ycbcr.png
rm tmp.pgm

TBR=r
R=r
CC=golang-codereviews
https://golang.org/cl/107330043
 2014-06-26 13:29:30 +10:00
Nigel Tao
94ba43c478 go.image/vp8l: new package. 
The blue-purple-pink image comes from
http://blog.golang.org/gophercon

The tux and yellow_rose images come from
https://developers.google.com/speed/webp/gallery2 and according to
that page, those images are in the public domain.

The gopher-doc images are http://golang.org/doc/gopher/doc.png
after quantizing its palette to 2/4/16/256 colors.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/109010043
 2014-06-17 21:51:57 +10:00
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
Nigel Tao
72be9c51b1 go.image/vp8: implement the loop filter. 
The testdata files were created by:
cwebp video-001.png -o video-001.webp
dwebp -pgm video-001.webp -o tmp.pgm
convert tmp.pgm video-001.webp.ycbcr.png
rm tmp.pgm

LGTM=r
R=r
CC=chaishushan, golang-codereviews
https://golang.org/cl/91700044
 2014-05-27 10:52:02 +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
e39b2394e5 go.image/tiff: encoder support Gray/Gray16/Paletted format 
Use these commands to generate testdata:

# TIFF Tools
tiff2bw    video-001.tiff video-001-gray.tiff
tiffmedian video-001.tiff video-001-paletted.tiff

# ImageMagick
convert -depth 16 video-001.tiff      video-001-16bit.tiff
convert -depth 16 video-001-gray.tiff video-001-gray-16bit.tiff

R=nigeltao, bsiegert
CC=golang-dev
https://golang.org/cl/13243047
 2013-09-13 17:42:53 +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
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