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Re: re-sizing png's

  • Subject: Re: re-sizing png's
  • From: Roy Schestowitz <newsgroups@schestowitz.com>
  • Date: Fri, 14 Jan 2005 03:30:21 +0000
  • Newsgroups: comp.graphics.apps.gimp
  • References: <34oheoF4drvofU1@individual.net>
  • User-agent: KNode/0.7.2
sam ende wrote:

> how do you re-size png's to a smaller file size best in gimp, (i don't
> understand the window that comes up; it's differnt to the jpeg window
> resize window) --there is a slider for compression and other options
> but i don't know what they mean and i've remade my site with new
> pictures but didn't think of image size upon rendering and, obviously,
> i don't really want to re-render or re-save as jpeg (as i would have to
> change the html then)
> thanks.

>From my experience, the PNG format is only powerful when using transparency
(alpha channel). The format is free and open (hence becoming an alternative
to GIF files).

it is better (in a world of imperfection) to reduce the pallete to indexed
of 255 colours, the reason being Internet Explorer (you mentioned that you
do this for a  site) which unfortunately is popular and yet does not
support 32-bit transparency.

The compression bar for PNG is not far different from the equivalent for
JPEG. High compression level = smaller size, lower quality. I don't know
about interlacing, but background colour needs to be saved and fit the
background color of your site. Saving of gamma and layer offset appear
unnecessary. Save the resolution, but creation time is a waste in my
opinion. Nobody ever looks at the image labels, not even for statistics


Roy Schestowitz

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