Search found 53 matches

by alasdairdf
2015-10-26T06:13:05-07:00
Forum: Users
Topic: Overlay multiple images onto canvas
Replies: 3
Views: 2510

Re: Overlay multiple images onto canvas

Thanks!

The positioning does not appear to be correct... if the geometry from the top-left corner of the canvas to the top-left corner of the image?
by alasdairdf
2015-10-26T04:40:36-07:00
Forum: Users
Topic: Overlay multiple images onto canvas
Replies: 3
Views: 2510

Overlay multiple images onto canvas

Hello, I need to make one large image from multiple smaller images. All are pbm, but then I want the output as png. Additionally the first image needs to be resized to 50%x50%. I understand more or less how to do this using many separate commands, but efficiency and speed is an issue so I'd like to ...
by alasdairdf
2015-04-24T07:41:50-07:00
Forum: Users
Topic: Convert image to TIF Group4 for embedding in PDF - image format is incorrect
Replies: 3
Views: 2642

Re: Convert image to TIF Group4 for embedding in PDF - image format is incorrect

I figured out that if I remove the first 8 bytes and the last 163 bytes then it's the same as the Ghostscript generated TIF and that works. So this can be closed.
by alasdairdf
2015-04-24T07:11:12-07:00
Forum: Users
Topic: Convert image to TIF Group4 for embedding in PDF - image format is incorrect
Replies: 3
Views: 2642

Re: Convert image to TIF Group4 for embedding in PDF - image format is incorrect

Yeah, tried that already and the resulting TIF image was identical. Thanks, though.
by alasdairdf
2015-04-24T06:58:34-07:00
Forum: Users
Topic: Convert image to TIF Group4 for embedding in PDF - image format is incorrect
Replies: 3
Views: 2642

Convert image to TIF Group4 for embedding in PDF - image format is incorrect

Hello, I'm converting PBMs to TIF Group 4 so they can be embedded into a PDF (I'm creating the TIFs with ImageMagick but not the PDF). The command I am using is: convert image.pbm -compress Group4 image.tif However, neither Acrobat, SumatraPDF nor Ghostscript will read any of the PDFs containing the...
by alasdairdf
2014-12-10T00:11:29-07:00
Forum: Users
Topic: Creating transparent JPEG2000
Replies: 9
Views: 8103

Re: Creating transparent JPEG2000

OK so defining the alpha type works on TIFF files, but JP2 files still refuse to set the alpha correctly.
by alasdairdf
2014-12-09T05:42:17-07:00
Forum: Users
Topic: Softlight
Replies: 9
Views: 6740

Re: Softlight

That is some magic. You should patent it and sell it Canon.
by alasdairdf
2014-12-09T04:27:00-07:00
Forum: Users
Topic: Creating transparent JPEG2000
Replies: 9
Views: 8103

Re: Creating transparent JPEG2000

Hi Fred, I put the version in the first post.
by alasdairdf
2014-12-09T04:24:55-07:00
Forum: Users
Topic: Softlight
Replies: 9
Views: 6740

Re: Softlight

this is more efficient, so that you do not read the input twice Cools, thanks! I've been working on this for two years, on and off: automatically making the "best" image from a raw camera file. For a while, I favoured a 50% blend of the "best gamma" image and an equalisation. Then I favoured a sigm...
by alasdairdf
2014-12-08T11:04:33-07:00
Forum: Users
Topic: Creating transparent JPEG2000
Replies: 9
Views: 8103

Re: Creating transparent JPEG2000

I give up. I'll make my own mask as a separate image and apply it myself on display.
by alasdairdf
2014-12-08T04:46:22-07:00
Forum: Users
Topic: Creating transparent JPEG2000
Replies: 9
Views: 8103

Re: Creating transparent JPEG2000

After hours more of testing I've discovered that converting from PNG to TIFF does exactly the same thing: there is an "Alpha 1" channel and it's not correctly recognized by anything. This is what Photoshop displays for the channels for both TIFF and JP2: http://i61.tinypic.com/znlils.png Whereas if ...
by alasdairdf
2014-12-08T03:17:51-07:00
Forum: Users
Topic: Creating transparent JPEG2000
Replies: 9
Views: 8103

Re: Creating transparent JPEG2000

Figured it out. It did work all along, just Photoshop had the transparent layer disabled by default. EDIT: OK, so it's not solved. It's not actually transparent, but it does contain an alpha layer. But the alpha layer does not do anything. If I convert it back from a jp2 to a PNG then the only thing...
by alasdairdf
2014-12-08T02:32:37-07:00
Forum: Users
Topic: Creating transparent JPEG2000
Replies: 9
Views: 8103

Creating transparent JPEG2000

I'm having a very difficult time trying to create a transparent JPEG2000. Specifically I want to create a transparent JPC file (JPEG2000 codestream) but a transparent JP2 would be a start. As far as I can tell ImageMagick uses JasPer library for JPEG2000 conversion. The problem with using JasPer dir...
by alasdairdf
2014-12-07T22:09:25-07:00
Forum: Users
Topic: Softlight
Replies: 9
Views: 6740

Re: Softlight

Oh wow! (Edit: apparently w0w is changed to ???) I feel like a bit of an idiot. What I was typing was: convert test.png -compose softlight -composite equalize.png softlight1.png Instead of: convert test.png equalize.png -compose softlight -composite softlight1.png Thanks a lot for your help Fred! Wi...
by alasdairdf
2014-12-07T12:08:03-07:00
Forum: Users
Topic: Softlight
Replies: 9
Views: 6740

Softlight

Hello, I need to do a transformation with IM that acts like Photoshop's softlight. IM's softlight composite mode gave me a completely different looking result to how Photoshop does it. Does anyone know what the difference is and how I can imitate a Photoshop-style softlight filter? The reason for al...