Search found 457 matches
- 2013-08-19T15:57:13-07:00
- Forum: Users
- Topic: Progressive jpg
- Replies: 5
- Views: 10740
Re: Progressive jpg
ImageMagick is great at image processing. It has many options when writing JPEGs . If your command is the last step of a longer process, fmw42's advice is perfect. But if you are only modifying jpeg attributes such as the coding, a jpeg specific tool, such as jpegtran , will work faster and with zer...
- 2013-08-19T07:33:21-07:00
- Forum: Users
- Topic: compare images with tolerance
- Replies: 3
- Views: 8461
Re: compare images with tolerance
Welcome. Also see http://imagemagick.org/script/compare.php Is AE the metric you want? Are only regions of your image changing? Is the image format lossless? Is a slightly brightened image 100% different? AE = absolute error count, number of different pixels (-fuzz effected) Or do you have your meth...
- 2013-08-19T07:21:49-07:00
- Forum: Users
- Topic: [[SOLVED]] Count pixels with distinct neighborhood
- Replies: 11
- Views: 7313
Re: Count pixels with distinct neighborhood
Welcome. Morphology is a neighborhood operator. http://www.imagemagick.org/Usage/morphology/ Can you provide an example image and give any constraints that may help? "binary black-and-white image" helps clarify. Does perimeter mean that you always have a single, solid, black shape on a whi...
- 2013-08-17T19:04:54-07:00
- Forum: Users
- Topic: Reversed Bilinear Distortion + Crop
- Replies: 4
- Views: 4783
Re: Reversed Bilinear Distortion + Crop
I'm not clear on your meaning. Do you know about the viewport setting of -distort ?etb972 wrote:the problem is that my image is not croped.. and has not the good size !
- 2013-08-16T23:41:21-07:00
- Forum: Users
- Topic: Removing complex vighetting
- Replies: 7
- Views: 7104
Re: Removing complex vighetting
fx expects expression in double quotes, while the examples use single quotes. My platform is Windows, which is the reason for the above. I don't think IM or fx care, but it does want one parameter. Windows breaks at spaces unless inside double quotes. Most examples need to be converted for Windows....
- 2013-08-16T14:23:02-07:00
- Forum: Users
- Topic: Removing complex vighetting
- Replies: 7
- Views: 7104
Re: Removing complex vighetting
-fx "u+v.p{w/2,h/2}-v" That puts a lot of weight on an individual pixel. Make sure the center one is a good one. It might help to blur ColorVign.tif slightly. HDRI is best. An alternative is to de-contrast using +level, do your correction, then re-contrast. -auto-level is ideal , but play...
- 2013-08-16T07:35:06-07:00
- Forum: Users
- Topic: From sRGB to CMYK and gamma?
- Replies: 48
- Views: 48735
Re: From sRGB to CMYK and gamma?
My mistake. I don't print using Gimp because it frequently gets the position wrong, but maybe this is an incompatibility with my very old printer. How are you printing?joew wrote:Printing from gimp is exactly what I want to avoid.
- 2013-08-16T07:25:31-07:00
- Forum: Digital Image Processing
- Topic: Fuzz culculator
- Replies: 21
- Views: 44526
Re: Fuzz culculator
u and v are the two images (pixels/colors) being compared. .r, .g, .b are the three channels. Red, green, blue for RGB. Or, somewhat confusingly, Lightness, a, b for Lab. Or hue, saturation, value for HSV. Etc. I found lab is more precise than RGB. Lab matches human perception better. But which colo...
- 2013-08-15T09:25:10-07:00
- Forum: Digital Image Processing
- Topic: Fuzz culculator
- Replies: 21
- Views: 44526
Re: Fuzz culculator
IM does have -fuzz, but it is only one method of calculating such things and may not be what you want. It will be affected by your -colorspace.
Source code is available:
http://www.imagemagick.org/script/install-source.php
Source code is available:
http://www.imagemagick.org/script/install-source.php
- 2013-08-15T09:17:57-07:00
- Forum: Users
- Topic: From sRGB to CMYK and gamma?
- Replies: 48
- Views: 48735
Re: From sRGB to CMYK and gamma?
You can print from Gimp and still let your printer driver handle the colorspace and sampling conversions.
You know your image's size in pixels, and you know what you want it printed in inches. Divide and set density (pixels per inch).
You know your image's size in pixels, and you know what you want it printed in inches. Divide and set density (pixels per inch).
- 2013-08-15T09:13:24-07:00
- Forum: Users
- Topic: How to widen transparency?
- Replies: 8
- Views: 7531
Re: How to widen transparency?
You want all lines and shapes thinned? Morphology is one option.
http://www.imagemagick.org/Usage/morphology/
The aliasing of your lines may add a step of complexity.
http://www.imagemagick.org/Usage/morphology/
The aliasing of your lines may add a step of complexity.
- 2013-08-15T08:49:37-07:00
- Forum: Users
- Topic: From sRGB to CMYK and gamma?
- Replies: 48
- Views: 48735
Re: From sRGB to CMYK and gamma?
I would let your printer do the sRGB to CMYK conversion unless you have a reason for doing otherwise. I would also let your printer do the -resample/-resize unless you have a reason. Use -density to set the print size.
- 2013-08-15T07:40:57-07:00
- Forum: Digital Image Processing
- Topic: Fuzz culculator
- Replies: 21
- Views: 44526
Re: Fuzz culculator
I second the suggestion to read up on colorspaces. This is a huge topic we couldn't do justice to here. There are no simple answers, so be prepared to commit some time and learn a lot. I realized that it is something completely different to calculate colors on real world painting than we do in IT wo...
- 2013-08-15T07:18:11-07:00
- Forum: Users
- Topic: From sRGB to CMYK and gamma?
- Replies: 48
- Views: 48735
Re: From sRGB to CMYK and gamma?
I figured, I should use the "-colorspace XXX" options instead of directly fiddling with gamma. Can anybody confirm this assumption? I would use -colorspace RGB and -colorspace sRGB above, especially since the sRGB gamma isn't quite 2.2 (or even constant). However, the improvement will be ...
- 2013-08-13T17:51:02-07:00
- Forum: Users
- Topic: how -trim images with black border and black background
- Replies: 17
- Views: 23378
Re: how -trim images with black border and black background
"Best I can suggest is do it twice, once with -trim and once with -shave. Then chose the larger of the two output images." But GreenKoopa's solution will produce the same result. I'm not sure that they are always the same. Each of the four sides may be trimmed more or less than the shave....