Useful tools to convert image format on PC

[#1]

When working with IPU applications, sometimes image format converter is needed to check images generated by IPU that are not readable by PC (e.g. RGB565, common i.MX framebuffer format -> png or jpg) or generate a RGB picture from an encoded file to be read by IPU (e.g. png -> RGB565 framebuffer).

There are some useful tools on Linux and some also available on Windows that can perform these conversions. I listed 5 tools with some usage examples below.

IMAGEMAGICK

// Display a 800x600 rgb image
display -size 800x600 -depth 8 rgb:output.rgb

// Show information of output.rgb
identify -size 1296x972 -depth 8 output.rgb

// Convert a 640x480 grayscale raw rgb file to png
convert -size 640x480 -depth 8 imagefile.rgb image.png

// To list all available color formats
identify -list format

For more information about Imagemagick and its format support. access: http://www.imagemagick.org/script/formats.php

FFMPEG

// List available formats for ffmpeg
ffmpeg -pix_fmts

// Convert raw rgb565 image to png
ffmpeg -vcodec rawvideo -f rawvideo -pix_fmt rgb565 -s 1024x768 -i freescale_1024x768.raw -f image2 -vcodec png screen.png

// Convert png to raw rgb565
ffmpeg -vcodec png -i image.png -vcodec rawvideo -f rawvideo -pix_fmt rgb565 image.raw

// Convert a 720x480 NV12 (YUV 420 semi-planar) image to png
ffmpeg -s 720x480 -pix_fmt nv12 -i image-nv12.yuv -f image2 -pix_fmt rgb24 image-png.png

// Convert a 640x480 uyvy422 image to png
ffmpeg -s 640x480 -pix_fmt uyvy422 -i image-uyvy422.yuv -f image2 -pix_fmt rgb24 image-uyvy422.png

MENCODER

http://www.mplayerhq.hu/DOCS/HTML/en/encoding-guide.html

TRANSCODING

http://www.transcoding.org/cgi-bin/transcode?Examples

GRAPHICSMAGICK

http://www.graphicsmagick.org/