Re: [Gimp-user] How can I reduce the size of a png using gimp?

2007-06-28 Thread Jozef Legeny
On 6/26/07, ying lcs [EMAIL PROTECTED] wrote:
 Thanks. I have tried it, but it does not help much. I wonder if I miss 
 anything.


if you have any transparency in your image it will increase the size
instead of shrinking it since it will add another channel to the
image. To ensure you have no transparency in your image use
image-flatten image

A good way to decrease the size of the image is to use either the
indexed mode or just use colors-posterize to decrease the number of
colors used. Be sure not to overwrite your original image since this
is not a lossless operation


-- 

LEGENY Jozef
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Re: [Gimp-user] How can I reduce the size of a png using gimp?

2007-06-25 Thread ying lcs
Thanks. Can you please tell me how can I reduce the color depth of my png image?

It currently has 24 color depth. I would like to reduce it to 8. how
can I do that in gimp?

Thank you.

On 6/25/07, vt [EMAIL PROTECTED] wrote:
 2007 m. birželis 25 d., pirmadienis 09:44, ying lcs rašė:
  Hi,
 
  How can I reduce the size of a png using gimp without losing much quality?
  Two ideas I have are:
  1. reduce the color depth of the image
  2. increase the compression level of in the png
 
  Any more ideas? And can you please tell me how can I do #1, #2 in gimp?
 
  Thank you.

 And you can reduce size by
 3. adjusting levels
 and/or by
 4. reduceing number of colours used.

 By the way none of these ways is lossless. And you could use say jpg for
 smaller size. Or gif.

 1. picturemodeindexed
 2. filesave as...choose where to save toCompresion level 1...9
 9th level has best compression. You can choose some other options there too.
 3.Layercolorslevels
 4. Layercolorscolor decrease (or something like that cause i use Gimp in my
 native language)


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Re: [Gimp-user] How can I reduce the size of a png using gimp?

2007-06-25 Thread Martin Lange
 How can I reduce the size of a png using gimp without losing much
 quality? [...]

It's not gimp, but very nice for crushing PNG-files from the shell:

pngcrush http://pmt.sourceforge.net/pngcrush/

HTHT.
Martin vi

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Re: [Gimp-user] How can I reduce the size of a png using gimp?

2007-06-25 Thread ying lcs
Thanks. How about this idea? If my image has a white color as it background,
will I save the image size if I convert my image to transparent?

Thank you.

On 6/25/07, Martin Lange [EMAIL PROTECTED] wrote:
  How can I reduce the size of a png using gimp without losing much
  quality? [...]

 It's not gimp, but very nice for crushing PNG-files from the shell:

 pngcrush http://pmt.sourceforge.net/pngcrush/

 HTHT.
 Martin vi

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