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lukair
Currently Being Moderated

Saving same png file gives me image with 10x smaller size

Mar 11, 2012 2:10 PM

Tags: #save #size #png #small

Hi.

 

I would appriciate if someone explained me what I'm doing wrong.

 

I have a png image, of 256x128 size. It has 8bits per pixel for color. Now this image's size is 97kB. I open it in photoshop, I save it as different png file, and then... this image is 7kB of size.

 

Can someone tell me what's wrong, or what I'm doing wrong?

 

Lucas

 
Replies
  • Currently Being Moderated
    Mar 11, 2012 2:37 PM   in reply to lukair

    The original might not be compressed. Or it might have a lot of metadata that didn't get resaved.

     
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  • Currently Being Moderated
    Mar 11, 2012 6:07 PM   in reply to lukair

    Viewing in a hex editor, that first file has a bunch of empty data. You don't seem to be losing anything by saving to 7kb from Photoshop.

     
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  • Currently Being Moderated
    Mar 11, 2012 11:23 PM   in reply to Marian Driscoll

    Aren't you confusing the opened size with the saved size?

     
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  • Currently Being Moderated
    Mar 13, 2012 12:41 PM   in reply to lukair

    I'm unable to follow the illustrations but the mention of alpha masks suggests you also look at Fireworks (free 30-day trial) and GIMP (free forever). Different programs handle PNG differently. Photoshop is actually pretty lousy for PNG, especially if you are dealing with PNG8 with alpha transparency.  That type of PNG is best handled by Fireworks.

     

    If you want to stick with Photoshop, experiment with saving from "File->Save As" and also "File->Save for Web". You get slightly different results.

     
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