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| author | Nigel Tao <nigeltao@golang.org> | 2016-10-20 16:57:55 +1100 |
|---|---|---|
| committer | Nigel Tao <nigeltao@golang.org> | 2016-10-20 22:27:28 +0000 |
| commit | 584e3ea2581c858688803d41e207eeaa881a2a85 (patch) | |
| tree | 71635a63af3fd64d3f8fc7de1683714100222e00 /src/database/sql/sql_test.go | |
| parent | a190f3c8a34b859dd578b1d30b48ecd04c7a99c7 (diff) | |
| download | go-584e3ea2581c858688803d41e207eeaa881a2a85.tar.xz | |
image/color: tweak the formula for converting to gray.
This makes grayModel and gray16Model in color.go use the exact same
formula as RGBToYCbCr in ycbcr.go. They were the same formula in theory,
but in practice the color.go versions used a divide by 1000 and the
ycbcr.go versions used a (presumably faster) shift by 16.
This implies the nice property that converting an image.RGBA to an
image.YCbCr and then taking only the Y channel is equivalent to
converting an image.RGBA directly to an image.Gray.
The difference between the two formulae is non-zero, but small:
https://play.golang.org/p/qG7oe-eqHI
Updates #16251
Change-Id: I288ecb957fd6eceb9626410bd1a8084d2e4f8198
Reviewed-on: https://go-review.googlesource.com/31538
Reviewed-by: Rob Pike <r@golang.org>
Diffstat (limited to 'src/database/sql/sql_test.go')
0 files changed, 0 insertions, 0 deletions