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add a -yuv option to dwebp (very similar to -pgm)

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It will decode to raw (flat) YUV format, similar to what
cwebp can take as input. Makes the PSNR/SSIM calculation easier.

Change-Id: Iebfaedfc0bedc70c169b24ae4aabc701488d0644
This commit is contained in:
skal
2013-01-28 23:22:14 +01:00
parent 841a3ba5da
commit 66c810bc3c
3 changed files with 49 additions and 17 deletions
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12
man/dwebp.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH DWEBP 1 "August 2, 2012"
.TH DWEBP 1 "January 28, 2013"
.SH NAME
dwebp \- decompress a WebP file to an image file
.SH SYNOPSIS
@ -31,9 +31,15 @@ Change the output format to PAM (retains alpha).
Change the output format to PPM (discards alpha).
.TP
.B \-pgm
Change the output format to PGM. The output consist of luma/chroma
Change the output format to PGM. The output consists of luma/chroma
samples instead of RGB, using the ICM4 layout. This option is mainly
for verification and debugging purpose.
for verification and debugging purposes.
.TP
.B \-yuv
Change the output format to raw YUV. The output consists of
luma/chroma-U/chroma-V samples instead of RGB, saved sequentially as
individual planes. This option is mainly for verification and debugging
purposes.
.TP
.B \-nofancy
Don't use the fancy upscaler for YUV420. This may lead to jaggy