$Id: image.txt 1869 2008-06-01 19:29:34Z mjs $

## FAQ: Why do the colours of the PNG file not match CSS colours?

This is probably caused by some embedded colour space information; see below
for how to remove this.

## HOWTO: Remove color space information from PNG files (pngcrush)

(You might want to do this to ensure that PNG colours match CSS colours.)

    $ pngcrush -rem gAMA -rem cHRM -rem iCCP -rem sRGB infile.png outfile.png

See

    http://hsivonen.iki.fi/png-gamma/

(Or, convert to GIF...)

## HOWTO: (Losslessly) compress PNGs (pngcrush)

    $ pngcrush image.png -rem alla -reduce result.png
    
See

    http://developer.yahoo.net/blog/archives/2008/03/yahoos_latest_p.html

## TIP: ImageMagick tips

See

    http://www.cit.gu.edu.au/~anthony/graphics/imagick/

## HOWTO: Convert string to image using TrueType font (ImageMagick)

Text on command line:

    $ convert -background white -fill black -font ~/Library/Fonts/P22UNDER.TTF \
      -transparent white -pointsize 72 label:"Holloway Rd" holloway.gif

Text in file:

    $ convert -background white -fill black -font ~/Library/Fonts/P22UNDER.TTF \
      -transparent white -pointsize 72 label:@holloway.txt holloway.gif

(This does do anti-aliasing, but I couldn't get a separate "matte"
colour working...)

HOWTO: Crop an image (ImageMagick)

    $ convert -mattecolor black src.jpg -crop 70x70+0+0 -size 70x70 +repage dst.jpg

ImageMagick 6+ use the "new" command-line parameter handling--the hard
bit is to make sure the different bits are specified in the right order!

## HOWTO: Mark a particular color as "transparent"

(Known as "Color to Alpha" in gimp.)

Use imagemagick:

    $ convert -transparent white foo.png bar.png

(I don't know how to do this with Pixelmator.)

HOWTO: Strip comments from JPEGs (jpegtran)

    $ jpegtran -copy none -optimize -perfect src.jpg dst.jpg
    
See

    http://developer.yahoo.net/blog/archives/2008/03/yahoos_latest_p.html