Search found 1147 matches

by glennrp
2006-04-08T06:09:20-07:00
Forum: Users
Topic: resize or scale image file size is too big
Replies: 1
Views: 9497

If the original doesn't have very many colors the resized one will have more. Use "identify -verbose" to find out how many colors are in your original, your output jpeg, and your output png. That may provide an explanation for the size differences.
by glennrp
2006-04-03T07:43:12-07:00
Forum: Users
Topic: RGB 8bits and Alpha 1bits
Replies: 2
Views: 13642

Identify says the alpha is 1-bit even though it's really 8-bit, when the only values are 0 and 255. The "resize" operation creates other values due to interpolation of alphas. To get back to the 0/255 condition, use -ordered-dither command (look it up to get the exact syntax; it's something like "-o...
by glennrp
2006-04-02T21:23:48-07:00
Forum: Developers
Topic: "Feather"-ed optimization of animated GIFs
Replies: 9
Views: 33183

There's a free application called "intergif" which might be useful to you as a final optimization step. I haven't used it lately but had good luck with it in the past.

Glenn
by glennrp
2006-04-01T21:33:57-07:00
Forum: Users
Topic: Reduce the size...
Replies: 1
Views: 9102

Try -quality 90
The "0" in the ones digit means not to use PNG filtering.
PNG filtering is usually ineffective when there are few (e.g. 256) colors.
by glennrp
2006-04-01T21:28:30-07:00
Forum: Users
Topic: Resize and Crop in one Step ?
Replies: 0
Views: 7514

Re: Resize and Crop in one Step ?

Hi, I'm fiddling around with convert for a while now. So i just give it a try in this forum :) My input image can be in landscape format or in panel format. (up to 1000x1000 pixels) Now i want to create a quadratic Thumbnail out of it. With one command-line-call if possible. My output size should b...
by glennrp
2006-04-01T08:21:05-07:00
Forum: Users
Topic: RGB 8bits and Alpha 1bits
Replies: 2
Views: 13642

P.S. you could try -sample instead of -resize.

Glenn
by glennrp
2006-04-01T08:19:37-07:00
Forum: Users
Topic: RGB 8bits and Alpha 1bits
Replies: 2
Views: 13642

May I have a copy of your source image? There is no such thing as a 1-bit alpha PNG unless you mean a PNG where the transparency is carried in the tRNS chunk.

Glenn