Search found 64 matches

by muccigrosso
2017-12-01T09:17:56-07:00
Forum: Users
Topic: Programmatically distinguish background gray
Replies: 4
Views: 2634

Programmatically distinguish background gray

I'm using IM to clean up some scanned grayscale pages from a text. Right now I clean up the background when there's some poor scanning artifacts like shadows near a book spine by doing a contrast stretch of 5%,90%. This works well _except_ when the page doesn't really need the cleanup. Then the stre...
by muccigrosso
2017-11-30T17:20:54-07:00
Forum: Users
Topic: JBIG2DECODE in pdf
Replies: 3
Views: 3937

Re: JBIG2DECODE in pdf

I'm trying to do this same thing. identify says "identify: no decode delegate for this image format `JBG2' @ error/constitute.c/ReadImage/509."
by muccigrosso
2017-10-03T14:04:02-07:00
Forum: Users
Topic: chop with percentage affects other dimension
Replies: 3
Views: 3655

Re: chop with percentage affects other dimension

What version of IM? Please ALWAYS state the version of IM. I can't find the thread, but a change was made recently, so that when a "%" was used in geometry, any result of zero was changed to one. This was to prevent "-resize 1%" etc from failing by trying to create an image of zero pixels. I suspec...
by muccigrosso
2017-10-03T11:19:52-07:00
Forum: Users
Topic: chop with percentage affects other dimension
Replies: 3
Views: 3655

chop with percentage affects other dimension

If I use -chop with a percentage in only one dimension, the second dimension loses a pixel too. For example (and here I'm chopping the width, but the results are the same if I use the height): convert -format "%w x %h" rose: info: yields: 70 x 46 convert -format "%w x %h" -gravity east -chop 1x0 ros...