Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!
On Thu, Jun 05, 2003 at 10:30:29AM +0100, Jonathan E. Paton wrote: Retake the screenshot, after reducing the size of the window. If you look at what the screenshot is of, you will notice that I can't make the window much smaller since that would hide information, or pack it very tightly. At 52Kb, the image size is satisfactory for broadband/LAN users. If the image is to be used on the web, why not consider using the image size attributes of HTML to automatically rescale the image? No, that's not what the image is for. I am writing a small manual on the use of OpenOffice Writer. It has many screenshots and together they do add up. You could also reduce the colour depth without any noticable drop in quality. Applications usually keep to a 256 colour default pallet. Yeah, I was thinking to do that. Thanks. -- Daniel Carrera | OpenPGP fingerprint: Graduate TA, Math Dept | 6643 8C8B 3522 66CB D16C D779 2FDD 7DAC 9AF7 7A88 UMD (301) 405-5137| http://www.math.umd.edu/~dcarrera/pgp.html pgp0.pgp Description: PGP signature
Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!
On Thu, Jun 05, 2003 at 01:31:47PM +0200, Sven Neumann wrote: $ du -sk * 52 screenshot.png 128 screenshot_resized.png The new image is over 4 times bigger than the original! 128 / 52 = 2.46 Okay, I forgot how to divide. But still. These are RGB images BTW, but that shouldn't cause this. Actually these are RGBA images. If you want to reduce the file size, you'd better flatten the image since I don't see any alpha information. Thanks. I didn't realize that they were. How do you tell appart an RGBA image from an RGB image? Gimp calls them both RGB. -- Daniel Carrera | OpenPGP fingerprint: Graduate TA, Math Dept | 6643 8C8B 3522 66CB D16C D779 2FDD 7DAC 9AF7 7A88 UMD (301) 405-5137| http://www.math.umd.edu/~dcarrera/pgp.html pgp0.pgp Description: PGP signature
Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!
Hi, Daniel Carrera [EMAIL PROTECTED] writes: Thanks. I didn't realize that they were. How do you tell appart an RGBA image from an RGB image? Gimp calls them both RGB. I used file foo.png but there are lots of indicators in GIMP as well. The most obvious is probably if you can Flatten the image or not. Sven ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!
--- Daniel Carrera [EMAIL PROTECTED] wrote:
On Thu, Jun 05, 2003 at 02:12:22AM +0200, Marco Wessel wrote:
My guess is that this is because of the interpolation when resampling.
Makes it less easily compressable. (Notice the 'anti-aliased' edges in
the resized picture?)
Marco Wessel
Any suggestion as to how to fix it?
Retake the screenshot, after reducing the size of the window.
Really. Resizing without anti-aliasing is like cutting 1 pixel
slivers out of the image, and can make vertical or horizontal
lines disappear out of the image.
At 52Kb, the image size is satisfactory for broadband/LAN users.
If the image is to be used on the web, why not consider using
the image size attributes of HTML to automatically rescale the
image?
http://www.w3.org/TR/html4/struct/objects.html#h-13.2
http://www.w3.org/TR/html4/struct/objects.html#visual
You could also reduce the colour depth without any noticable
drop in quality. Applications usually keep to a 256 colour
default pallet.
Magic bullets not found here.
Jonathan Paton
=
#!perl
$J=' 'x25 ;for (qq 1+10 9+14 5-10 50-9 7+13 2-18 6+13
17+6 02+1 2-10 00+4 00+8 3-13 3+12 01-5 2-10 01+1 03+4
00+4 00+8 1-21 01+1 00+5 01-7 =~/ \S\S \S\S /gx) {m/(
\d+) (.+) /x,, vec$ J,$p +=$2 ,8,= $c+= +$1} warn $J,,
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Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!
Hi, Daniel Carrera [EMAIL PROTECTED] writes: This is really weird. I have a PNG image. I tried to make it smaller by resizing it down, but instead it got BIGGER. I don't understand this at all. I put the images on the web: Original: http://www.math.umd.edu/~dcarrera/screenshot.png Resized: http://www.math.umd.edu/~dcarrera/screenshot_resized.png With width and height of the resized image are 0.8 times the size of the original, so I would have imagined that the resized image would be 0.8*0.8 = 0.64 times the size of the original, but that's not the case: $ du -sk * 52 screenshot.png 128 screenshot_resized.png The new image is over 4 times bigger than the original! 128 / 52 = 2.46 These are RGB images BTW, but that shouldn't cause this. Actually these are RGBA images. If you want to reduce the file size, you'd better flatten the image since I don't see any alpha information. Sven ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!
My guess is that this is because of the interpolation when resampling. Makes it less easily compressable. (Notice the 'anti-aliased' edges in the resized picture?) Marco Wessel On Wed, 4 Jun 2003, Daniel Carrera wrote: Hi, This is really weird. I have a PNG image. I tried to make it smaller by resizing it down, but instead it got BIGGER. I don't understand this at all. I put the images on the web: Original: http://www.math.umd.edu/~dcarrera/screenshot.png Resized: http://www.math.umd.edu/~dcarrera/screenshot_resized.png With width and height of the resized image are 0.8 times the size of the original, so I would have imagined that the resized image would be 0.8*0.8 = 0.64 times the size of the original, but that's not the case: $ du -sk * 52 screenshot.png 128 screenshot_resized.png The new image is over 4 times bigger than the original! These are RGB images BTW, but that shouldn't cause this. Does anyone know what's happening? ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!
On Thu, Jun 05, 2003 at 02:12:22AM +0200, Marco Wessel wrote: My guess is that this is because of the interpolation when resampling. Makes it less easily compressable. (Notice the 'anti-aliased' edges in the resized picture?) Marco Wessel Any suggestion as to how to fix it? -- Daniel Carrera | OpenPGP fingerprint: Graduate TA, Math Dept | 6643 8C8B 3522 66CB D16C D779 2FDD 7DAC 9AF7 7A88 UMD (301) 405-5137| http://www.math.umd.edu/~dcarrera/pgp.html pgp0.pgp Description: PGP signature
