Legacy ImageMagick Discussions Archive

I was able to dig this up in BMP.c, line 1583, specifically for the format I'm using (BMP2): bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32); So I'm going to assume that stride info is determined privately by each image type handler as needed, and it isn't exposed as a property in ...

Stride is different than height or width; I'm looking for the stride (or pitch?) http://msdn.microsoft.com/en-us/library/windows/desktop/aa473780.aspx Right now i'm just using stride = columns * channel count, but don't know how to account for any other padding that may exist. I'm using the BMP2 for...

Thanks. I re-reviewed the documentation, but was unable to determine which attribute is the 'stride'. What is the name of the stride attribute?

I'm using the latest IM and the Magick++ interface. I need to provide an image's stride, along with the image width, to a function in a 3rd party library. However, I don't see how to retrieve/calculate an image's stride via the API. Any hints on how I can determine this info? I checked the docs and ...

Thanks for the reply and your assistance with this issue. Bug posted as requested:

viewtopic.php?f=3&t=22130

Reference post: http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=22128 Test environment: IM 6.8.0.2 x64 debug, MSVC 11, Win7 x64 Problem: a simple file read & file write changes the shading of the following image (via color reduction), unless '-set colorspace RGB' is specified...

Thanks for the replies. What can I do to detect/work around this issue programmatically? I'm in the process of creating some specialized image manipulation routines in C++ ; I have a requirement to be able to handle a variety of inputs, and produce a lossless output. I'm assuming I can't just global...

Hi, Using IM 6.8.0.2 x64 debug build on Win7, a simple file read & file write noticeably changes the shading of the following image: Source file: http://cssignet.free.fr/png-test-corpus/01-c3-shouldbe-c0.png I am using the Magick++ interface, but was also able to reproduce this same behavior wit...

Awesome, thanks guys.

Version 6.8.0.2 file: coders/png.c line: 11364 Issue: specifying a png:compression-filter value of "0" causes an exception to be thrown due to a missing 'else' statement on line 11364. "0" is a valid value for the operation. code in png.c ( starts on line 11348 ) value=GetImageAr...