PNG optimization guide
4 tips for optimizing PNG images for Gimp users. It will be useful for beginner typesetters.
As a result of experiments with Gimp 2.6 and PNG images, I managed to find out the following interesting facts:
1. If you are preparing a sprite image (for CSS-layout), it is better to arrange the image elements in a horizontal line. This will reduce the file size in some cases by almost half!
2. Before saving, it is useful to put the image in indexed mode (Image -> Mode -> Indexed).
3. When saving an image, it is better to uncheck Interlacing (Adam7).
The result will be a very compact file. However, it can still be squeezed.
4. Additional compression is possible with OptiPNG andAdvanceCOMP .
For Ubuntu users , these two compressors can be installed as follows: or via Synaptic. For FreeBSD (thanks to iZENfire ): OptiPNG: install from port: cd / usr / ports / graphics / optipng / && make install clean or install from package: pkg_add -r optipng AdvanceCOMP: install from port: cd / usr / ports / archivers / advancecomp / && make install clean or install from the package: pkg_add -r advancecomp For all other Google to help. For the results of Photoshop, these two programs will also be very useful.
After installing OptiPNG and AdvanceCOMP, you can use them like this:
optipng -o7 (sometimes compresses almost twice)
and then
advpng -z4 .png (throws from 5 to 1%)
For example:
As a result of experiments with Gimp 2.6 and PNG images, I managed to find out the following interesting facts:
1. If you are preparing a sprite image (for CSS-layout), it is better to arrange the image elements in a horizontal line. This will reduce the file size in some cases by almost half!
2. Before saving, it is useful to put the image in indexed mode (Image -> Mode -> Indexed).
3. When saving an image, it is better to uncheck Interlacing (Adam7).
The result will be a very compact file. However, it can still be squeezed.
4. Additional compression is possible with OptiPNG andAdvanceCOMP .
For Ubuntu users , these two compressors can be installed as follows: or via Synaptic. For FreeBSD (thanks to iZENfire ): OptiPNG: install from port: cd / usr / ports / graphics / optipng / && make install clean or install from package: pkg_add -r optipng AdvanceCOMP: install from port: cd / usr / ports / archivers / advancecomp / && make install clean or install from the package: pkg_add -r advancecomp For all other Google to help. For the results of Photoshop, these two programs will also be very useful.
sudo apt-get install optipng
sudo apt-get install advancecompAfter installing OptiPNG and AdvanceCOMP, you can use them like this:
optipng -o7 (sometimes compresses almost twice)
and then
advpng -z4 .png (throws from 5 to 1%)
For example:
optipng -o7 myimagefile.png
advpng -z4 myimagefile.png