Search found 11 matches

by rshea
2012-09-20T16:06:08-07:00
Forum: Users
Topic: How to improve the 'printability' of this image ?
Replies: 2
Views: 4507

How to improve the 'printability' of this image ?

[Disclaimer (!): this post overlaps with my previous one at http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=21855 but things have moved on a little since then] IN SUMMARY I'm helping a friend of mine with some photographs of sheet music and I'm hoping you can help me ! I'd like a tec...
by rshea
2012-09-13T05:24:49-07:00
Forum: Users
Topic: Making Photographed Pages appear white
Replies: 1
Views: 2716

Making Photographed Pages appear white

I have a lot of JPG images created by photographing sheet music on a point and shoot camera. I've managed to clean them up quite a bit by converting them to PNG8, making them greyscale and doing a -contrast-stretch . The musical notes etc are now looking OK but the paper remains a bit 'grey' looking...
by rshea
2010-03-21T17:20:24-07:00
Forum: Users
Topic: Change all pixels of colour 'a' to colour 'b'
Replies: 4
Views: 8534

Re: Change all pixels of colour 'a' to colour 'b'

Thanks to you both. I ended us using the fmw42 option but thank you snigbo for your suggestion, much appreciated.

regards

Richard.
by rshea
2010-03-21T15:23:46-07:00
Forum: Users
Topic: Change all pixels of colour 'a' to colour 'b'
Replies: 4
Views: 8534

Change all pixels of colour 'a' to colour 'b'

I'm sure this is the simplest question asked in a long time but I can't see how to do it. I have an image in which all pixels which are currently, say, RGB(10,10,10) I want changed to RGB(20,20,20). I've looked at -clut but that seems very complex for the problem involved. To be specific the histogr...
by rshea
2010-03-14T01:52:18-07:00
Forum: Users
Topic: Produce 'black' and 'other than black' images ?
Replies: 4
Views: 7708

Re: Produce 'black' and 'other than black' images ?

Hi fmw42 - Thanks very much for your reply, I appreciate it. The second of your two options works beautifully. I just adjusted it slightly as I'm working on a 16bit version of IM (installed in rather a piecemeal way on Windows Vista) and I've found in the past that without -depth 8 the output of con...
by rshea
2010-03-13T04:18:56-07:00
Forum: Users
Topic: Produce 'black' and 'other than black' images ?
Replies: 4
Views: 7708

Re: Produce 'black' and 'other than black' images ?

I just want to clarify something about this question. When I say I'd like to produce two images - one which contains only the line on the axes/labels and one which contains everything else. I really mean I want one image which contains everything in the original image that is rgb(0,0,0) and one imag...
by rshea
2010-03-13T04:16:38-07:00
Forum: Users
Topic: Produce 'black' and 'other than black' images ?
Replies: 4
Views: 7708

Produce 'black' and 'other than black' images ?

Hi - I've got an TIF which contains a line graph. The axes/labels etc are all RGB(0,0,0) the line on the graph is rgb(143,174,214). Everything else is white. I'd like to produce two images - one which contains only the line on the axes/labels and one which contains everything else. I've done this : ...
by rshea
2010-03-12T17:55:10-07:00
Forum: Users
Topic: Convert -profile ... force colour A to colour B ?
Replies: 0
Views: 2571

Convert -profile ... force colour A to colour B ?

Hi - I'm using : convert.exe f1.tiff +profile icc -profile AdobeRGB1998.icc -profile USWebCoatedSWOP.icc -strip f2.tiff to convert the colour management of an image f1.tiff from RGB to CMYK and it works fine. What I'd like to do as well is to ensure that all the rgb(0,0,0) in the input image become ...
by rshea
2009-12-01T02:33:14-07:00
Forum: Users
Topic: TIFF conversion RGB->CMYK 'the right way'
Replies: 2
Views: 6485

Re: TIFF conversion RGB->CMYK 'the right way'

Just answering my own post here for the sake of future readers. It turns out that in using the 16 bit ImageMagick I was ending up with 16-bit/channel which the Python Image Library didn't like. I was able to force the output to 8 bit using the -depth 8 argument. I didn't work this out myself it come...
by rshea
2009-11-30T03:53:10-07:00
Forum: Users
Topic: TIFF conversion RGB->CMYK 'the right way'
Replies: 2
Views: 6485

Re: TIFF conversion RGB->CMYK 'the right way'

Just realised that I should have included the output from 'identify' for these two files so here it is First after the initial CMYK conversion : E:\bin\installed\ImageMagick-6.3.4-0-Q16>identify.exe -verbose H:\Shea\CMYKExperiment\ZENDGraphOutput-Step1.TIF Image: H:\Shea\CMYKExperiment\ZENDGraphOutp...
by rshea
2009-11-30T02:15:56-07:00
Forum: Users
Topic: TIFF conversion RGB->CMYK 'the right way'
Replies: 2
Views: 6485

TIFF conversion RGB->CMYK 'the right way'

Hi - I have a RGB TIF which I want to convert to use CMYK. Everything appears to work well but the Python Imaging Library (PIL) chokes on the output. Before I dig too far into PIL I'd like to be sure I'm doing the right thing when making the conversion from an ImageMagick point of view. I do two dif...