John Nichel wrote:
Al wrote:
Philip Hallstrom wrote:
I'm trying to resize GIF images and up with very large files
For example:
Original width = 720
New width = 980
Original height = 1008
New height = 1274
Original filesize = 80kb
After resizing = 235kb
Based on the area increase; I'd expect the file size to about
double, not be 4x as large.
$src_img = imagecreatefromgif($filename);
$dest_img = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($dest_img, $src_img, 0, 0, 0, 0, $new_width,
$new_height, $org_width, $org_height);
imagegif($dest_img, $filename);
I tried using imagetruecolortopalette() and it helped a little; but
screwed up the image quality.
Can anyone explain or have a solution?
What's the image? If it's photo-like, save it as a PNG or JPEG and
you'll get much smaller files. GIF's don't do very well with some
images as it can't encode them very efficiently.
I don't remember which way it goes, but a 1x500 gif of a solid color
will be much much much larger than a 500x1 gif of a solid color. The
latter it can compress by sayign something like "x color for the next
500 columns on this row".
If it were me, I'd try jpeg/png first.
The image is a simple 4 color street map. Out of the image editor,
these images are always much smaller than reasonably compressed jpgs
or pngs. I need to keep the file size small as many of our users
still use dial-up.
If your original is only 4 color, I'm guessing that your new image is
256 colors, giving you the 'out of proportion' filesize.
That was my original thought also. So I tried using imagetruecolortopalette() with limited colors and the colors went
goofy at less than about 100. The file size saving wasn't appreciable.
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