Search found 168 matches

by pipitas
2015-02-23T15:27:27-07:00
Forum: Bugs
Topic: Colors for very small JPEG images are way off: bug or feature?
Replies: 4
Views: 4474

Re: Colors for very small JPEG images are way off: bug or feature?

That is the nature of JPEG. I know JPEG is lossy.... Bonus answer: No. ...but I don't get this, to be honest. After all, these are only 4 pixels, all in all. So there is no way in JPEG to precisely describe the colors for each single one of only 4 pixels in a very small image, "losslessly" if you l...
by pipitas
2015-02-23T03:22:55-07:00
Forum: Bugs
Topic: Colors for very small JPEG images are way off: bug or feature?
Replies: 4
Views: 4474

Re: Colors for very small JPEG images are way off: bug or feature?

Nevermind... for now I succeeded with a "good enough" result by adding -quality 100% to the JPEG creation commands. Now the resulting color values are: # ImageMagick pixel enumeration: 2,2,255,srgb 0,0: (254,0,0) #FE0000 srgb(254,0,0) 1,0: (0,128,1) #008001 srgb(0,128,1) 0,1: (0,0,254) #0000FE srgb(...
by pipitas
2015-02-23T03:16:50-07:00
Forum: Bugs
Topic: Colors for very small JPEG images are way off: bug or feature?
Replies: 4
Views: 4474

Colors for very small JPEG images are way off: bug or feature?

I noticed that JPEGs do have colors which are very far off from the originals, if the image dimensions are very small. (It happened when I scaled down a larger image.) To test this further, I created a very small, 2x2 pixel image with the following command: PNG: convert \ -size 1x1 \ \( xc:red xc:gr...
by pipitas
2015-02-16T09:34:50-07:00
Forum: Bugs
Topic: Windows portable 'convert -list configure' reports wrong version
Replies: 3
Views: 3729

Windows portable 'convert -list configure' reports wrong version

After downloading the portable ImageMagick ZIP file for Windows here: http://www.imagemagick.org/download/binaries/ImageMagick-6.9.0-6-Q16-x86-windows.zip and copying its content to c:\pa\ I get these contradictionary bits of information when trying to determine the version of the binaries: C:\Users...
by pipitas
2015-02-09T07:30:50-07:00
Forum: Bugs
Topic: [RESOLVED] ImageMagick identify crashes with pdf
Replies: 3
Views: 5218

Re: ImageMagick identify crashes with pdf

lost_in_binary wrote:Thank you. This must be it then, even though I am using the latest version of Ghostscript (9.3) I still get this error.
There is no Ghostscript 9.3. The latest released version is v9.15, the upcoming version likely will get named v9.16.
by pipitas
2015-02-06T07:43:40-07:00
Forum: Bugs
Topic: [RESOLVED] ImageMagick identify crashes with pdf
Replies: 3
Views: 5218

Re: ImageMagick identify crashes with pdf

For investigating a PDF file, ImageMagick is the totally wrong tool. All ImageMagick commands employ 'delegates' to handle input PDFs. They use Ghostscript first to convert all PDF pages to raster images. Only after that step they take their first look at raster images to do something with it. Not e...
by pipitas
2015-02-05T12:11:51-07:00
Forum: Bugs
Topic: Conversion from PDF to PNG contains unwanted artifacts
Replies: 14
Views: 8778

Re: Conversion from PDF to PNG contains unwanted artifacts

I tested a few more (direct) Ghostscript-conversions to raster formats: '-sDEVICE={tiff24nc,png16m,jpeg}' . All these didn't produce the artifact. It's only the 'pngalpha' -device which has the problem. Maybe this is a chance to find a workaround? [*][/b][/color] Provided, your IM has a setup which ...
by pipitas
2015-02-05T11:50:48-07:00
Forum: Bugs
Topic: Conversion from PDF to PNG contains unwanted artifacts
Replies: 14
Views: 8778

Re: Conversion from PDF to PNG contains unwanted artifacts

It's clear then: a Ghostscript bug.
by pipitas
2015-02-05T08:43:37-07:00
Forum: Bugs
Topic: Conversion from PDF to PNG contains unwanted artifacts
Replies: 14
Views: 8778

Re: Conversion from PDF to PNG contains unwanted artifacts

I added a -density 4800 closeup of one of the arrowheads to the above-mentioned web page. It does look to me as though the little triangle was deliberately drawn there. If so, then all the PDF viewers I tested [*][/color][/b] the input PDF with (apart from Ghostscript-based 'gv'), do have the same ...
by pipitas
2015-02-04T14:20:45-07:00
Forum: Bugs
Topic: Conversion from PDF to PNG contains unwanted artifacts
Replies: 14
Views: 8778

Re: Conversion from PDF to PNG contains unwanted artifacts

What 'identify -verbose some.pdf' tells you are many details supposedly about the input PDF which are not relevant at all for the PDF. The reason: identify (as ImageMagick in general) cannot directly handle PDF itself. It uses Ghostscript as its 'delegate' to process input PDF pages and convert them...
by pipitas
2015-01-30T08:10:26-07:00
Forum: Developers
Topic: New image format BPG -- something for ImageMagick to support?
Replies: 6
Views: 10073

Re: New image format BPG -- something for ImageMagick to support?

The current release of ImageMagick can process BPG images under Linux if the BPG binaries are installed. That was fast! Thnk you very much :D (I assume with "current release" you mean v6.9.0-5 to be released sometime soon -- not the v6.9.0-4 released 2015-01-16?) BTW, your last couple of dates in t...
by pipitas
2015-01-28T06:29:31-07:00
Forum: Users
Topic: can I create a PDF which will always open at zoom 100% ?
Replies: 2
Views: 2964

Re: can I create a PDF which will always open at zoom 100% ?

From my rusty memory, the following additional parameter to a Ghostscript command (when running a recent v9.xx version of Ghostscript!) should set the initial view parameters for the viewer: -c "[ /PageMode /UseNone /Page 1 /View [ /XYZ null null 1 ] /PageLayout /SinglePage /DOCVIEW pdfmark" Please ...
by pipitas
2015-01-22T10:57:05-07:00
Forum: Bugs
Topic: Spelling of 'tIME' in output of 'identify -verbose' ?
Replies: 2
Views: 2595

Re: Spelling of 'tIME' in output of 'identify -verbose' ?

dlemstra wrote:This might look like a typo but it is the correct spelling of the tag, more info can be found here: http://www.sno.phy.queensu.ca/~phil/exi ... s/PNG.html
Oh... Interesting!

Thanks for the info. :)
by pipitas
2015-01-22T04:15:29-07:00
Forum: Bugs
Topic: Spelling of 'tIME' in output of 'identify -verbose' ?
Replies: 2
Views: 2595

Spelling of 'tIME' in output of 'identify -verbose' ?

This is a 'MacPorts' installation of ImageMagic on a MacBook: identify -version Version: ImageMagick 6.9.0-0 Q16 x86_64 2014-12-06 http://www.imagemagick.org [....] I've just noticed this weird spelling of 'tIME' in the output of 'identify -verbose'. I wonder if it is just a harmless typo in the sou...