Search found 12163 matches

by snibgo
2010-03-24T06:44:53-07:00
Forum: Users
Topic: How to convert TIFFG4 compressed 1-bit bilevel to gray
Replies: 27
Views: 54793

Re: How to convert TIFFG4 compressed 1-bit bilevel to gray

On Windows 7, 4 GB RAM, IM 6.6.0-8: convert large_g4.tif -scale 10% -colorspace Gray preview.tif convert large.tif -scale 10% -colorspace Gray preview2.tif both worked fine, with the TIFFReadDirectory warning on the first file. Each used 0.5GB of my memory, but your mileage will vary. I suggest you ...
by snibgo
2010-03-24T06:22:10-07:00
Forum: Users
Topic: Converting BMP to fixed size JPEG
Replies: 2
Views: 6725

Re: Converting BMP to fixed size JPEG

convert in.bmp -quality 50 out.jpg I don't think IM has an automated facility to choose the highest quality with a cap on the resulting filesize. You would have to do that in a script. Personally, I would reduce the "quality" number until either I reached the 64KB limit or quality became ...
by snibgo
2010-03-24T06:14:00-07:00
Forum: Users
Topic: Reduce noise like Photoshop
Replies: 12
Views: 33112

Re: Reduce noise like Photoshop

You can do all that in ImageMagick, including median and auto levels. I don't know how IM's noise reduction compares to Photoshop's -- I don't use PS, nor do I de-noise images. You would have to play with IM to see what you like. For example: convert in.jpg -resize 320x240+0+0 -noise 5 -median 5 -un...
by snibgo
2010-03-23T17:11:27-07:00
Forum: Users
Topic: How to convert TIFFG4 compressed 1-bit bilevel to gray
Replies: 27
Views: 54793

Re: How to convert TIFFG4 compressed 1-bit bilevel to gray

How much memory do you have? Try it with no other software running. Put it online, and someone with a larger machine might have a go at it.
by snibgo
2010-03-23T17:07:15-07:00
Forum: Users
Topic: Convert/ Caption- Working out whether to resize text
Replies: 12
Views: 27505

Re: Convert/ Caption- Working out whether to resize text

There might be a shortcut available by calling MagicWand from a custom program, but I can't see a quicker way using commands. It needs two passes: first to try at the user-requested pointsize, then (if necessary) let IM choose a smaller size. I don't think there is any way to tell the first pass to ...
by snibgo
2010-03-23T12:12:12-07:00
Forum: Users
Topic: How to get mosaic view of an image...?
Replies: 13
Views: 26725

Re: How to get mosaic view of an image...?

Did I say 5.8? I meant 6.5.8. I've wanted 6.6 for a while, but I've been working on a project with a climax/demo last Friday. Everything had to work exactly as rehearsed with no surprises whatsoever, apart from my fluff-ups of course. http://www.imagemagick.org/script/command-line-options.php under ...
by snibgo
2010-03-23T11:12:24-07:00
Forum: Users
Topic: How to get mosaic view of an image...?
Replies: 13
Views: 26725

Re: How to get mosaic view of an image...?

Ah, thanks. I've only just upgraded from 5.8. All these wonderful new toys! (Sorry for calling you "ftw".)
by snibgo
2010-03-23T08:58:55-07:00
Forum: Users
Topic: How to get mosaic view of an image...?
Replies: 13
Views: 26725

Re: How to get mosaic view of an image...?

@ftw42:

Code: Select all

convert fish.jpg -crop 3x3@ ...
This "@" switch on crop, which seems to divide into equal portions, is new to me. I can't find it documented anywhere. Is it?
by snibgo
2010-03-23T03:09:38-07:00
Forum: Users
Topic: Convert/ Caption- Working out whether to resize text
Replies: 12
Views: 27505

Re: Convert/ Caption- Working out whether to resize text

Add -geometry center and it should center it the best it can, if I am not mistaken You mean, I assume, "-gravity center". Yes, -gravity works with caption. i believe that you can add -geometry to -gravity in order to adjust the alignment. "-geometry" doesn't work for me with &qu...
by snibgo
2010-03-22T09:31:40-07:00
Forum: Users
Topic: Best command for resizing large pics for highest quality.
Replies: 16
Views: 43961

Re: Best command for resizing large pics for highest quality

At 800% magnification, I can't see any unsharp masking in that PS image, compared to the IM version.

On a flicker comparison, I can't see any difference -- there is no flicker.

Incidentally, it may be worth upgrading IM that is a couple of years old.
by snibgo
2010-03-22T09:02:11-07:00
Forum: Users
Topic: Save multiple files keeping filenames
Replies: 3
Views: 8587

Re: Save multiple files keeping filenames

I don't understand what you want. "mogrify" will change files without creating new ones. Does that help?

[Cross-posted]
by snibgo
2010-03-22T08:44:48-07:00
Forum: Users
Topic: Best command for resizing large pics for highest quality.
Replies: 16
Views: 43961

Re: Best command for resizing large pics for highest quality

When I place those images side-by-side, I can't detect any difference. (They look different when placed vertically on LCD monitors, because LCD monitors do that.) When I examine them with Gimp color picker, sample average, radius 20, on the red truck at location 261,82: image 52194_1269256674.jpg re...
by snibgo
2010-03-22T04:36:58-07:00
Forum: Users
Topic: Image size after convert -composite
Replies: 5
Views: 12315

Re: Image size after convert -composite

Hmm. Perhaps a script could use "-metric" to graph size versus quality setting, and find an optimum. I'll add this to my huge pile of "things to try when I can find the time".
by snibgo
2010-03-22T04:29:39-07:00
Forum: Users
Topic: Image size after convert -composite
Replies: 5
Views: 12315

Re: Image size after convert -composite

I think the default IM uses for saving jpegs is 85. Perhaps your input files don't warrant this, so you might try "-quality 50" or 25 or 10. (I often find that 50 is good enough for web work, and would expect 10 to be very small but horrble quality.) I wish IM (and other tools) had an auto...
by snibgo
2010-03-22T03:21:55-07:00
Forum: Users
Topic: Image size after convert -composite
Replies: 5
Views: 12315

Re: Image size after convert -composite

One of your inputs is a jpeg. I suspect it is a photograph, and these don't compress so well in png format. (Partly because png is lossless, but mostly because png just isn't designed to compress photographs well). If you save the result to jpg, you can probably get a much smaller file size. "Q...