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PNG image size

Jan 21, 2012, 17:43 (This post was last modified: Jan 21, 2012 17:45 by RISC OS.)
Post: #1
PNG image size
Hello,

I'm new to using GIMP. At work I use Photoshop, but at home I have started using GIMP.

One problem I cosntantly have is the size of pngs. How do you reduce the size of pngs?

I have 400KB png, when I save the same image at home in GIMP as jpg it becomes smaller, but if I save it as png it becomes about 2MB - this is huge compared to photoshop

If I use the save for web plugin, the results are the same for jpgs, but if I save as 24bit png the image suddenly becomes 2.5MB.

Why are PNGs in GIMP so large?

PS: I use windows vista, in case this matters.
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Jan 21, 2012, 18:32 (This post was last modified: Jan 21, 2012 18:39 by ofnuts.)
Post: #2
RE: PNG image size
PNGs are PNGs, whether they come from PS or Gimp. There are options that will have an influence on size (like the use of indexed colors, which maybe what happens when you save for web), but without looking at the images I can only make guesses.

PS: using a 1024x1024 image: saving it directly as PNG yields an image just under one megabyte (970K). As a plain 24bpp bitmap it would take 3MB. After "Image/Mode/Indexed" with 256 colors, saving as PNG creates an image which is 286KB. The same image as a 90% quality JPEG is 144KB. Note that both indexed PNG and JPG cause information loss. It's OK for display, but not for storage.

Now answering your questions on
https://Gimp-Forum.net
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Jan 21, 2012, 22:17
Post: #3
RE: PNG image size
When you save a PNG on GIMP - What compression level do you set? - it directly affects the size on disk.
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