Legacy ImageMagick Discussions Archive

Hello, this change is being discussed here:

https://github.com/ImageMagick/ImageMagick/pull/477

If you'd like to follow progress or suggest improvements or do some coding.

OK, PR opened:

https://github.com/ImageMagick/ImageMagick/pull/477

It looks like this commit is the cause, not the refactoring I fingered earlier:

https://github.com/ImageMagick/ImageMag ... 4ec0b734dd

"The DICOM reader now handles the rescale intercept and slope." from Nov 2015.

6.9.1-10 works, 6.9.2-10 fails.

Unfortunately, many DICOM images use fractional units, for example here the unit is t0, relaxation time. If I have a ushort image with rescale_slope == 0.1 and I express this as an int image, I'm immediately losing 10x of my precision. I think if you bake rescale_slope into the image, you must ...

I could have a go at preparing a patch.

I propose simply not interpreting the scale and intercept. Does that sound acceptable?

Hi, it looks like the refactoring of dcm pixel reads last year has broken dicom read for many files. Here's a sample image: http://www.rollthepotato.net/~john/MRIm5.dcm It's a 16-bit, one channel MRI Image. You are welcome to use the image in a test suite. If I examine it with ImageMagick-6.9.8-4 ...

Hi, there's a small error in the equation given here: http://www.imagemagick.org/Usage/color_mods/#sigmoidal It reads: ( 1/(1+exp(β*(α-u))) - 1/(1+exp(β)) ) / ( 1/(1+exp(β*(α-1))) - 1/(1+exp(β*α)) ) It should be: ( 1/(1+exp(β*(α-u))) - 1/(1+exp(β*α)) ) / ( 1/(1+exp(β*(α-1))) - 1/(1+exp(β*α)) ) ie. th ...

I had a quick look at dcm.c and I don't think it'll ever support Ping properly.

Please ignore this thread.

Hi, I'm updating my image read class to work with im7 and I think I might have found a bug in the dicom reader. This is in 7.0.2-5. Here is a 128x128 unsigned 16-bit image (a slice from a PET scan): https://github.com/jcupitt/libvips/blob/add-magick7/test/images/dicom_test_image.dcm If I PingImage ...

Works well here. Thank you very much!

I've found a case when this fails. If I PingImage()/InitializePixelChannelMap(image) on a PDF I see: image->depth = 16 GetImageType() = 6 GetPixelChannels() = 3 But if I ReadImage() the same file I see: image->depth = 16 GetImageType() = 7 GetPixelChannels() = 4 I'd obviously like Ping and Read to ...

It works! And it makes PingBlob() work too.

Thank you very much. I have another question, I'll start a fresh topic.

Hi all, I'm rewriting an import class for imagemagick7, lots of nice improvements, thank you. I'd like to be able to call PingImage() and then get the number of channels with GetPixelChannels(image), but this seems to return 0, at least for JPEG images. It seems I can only use GetPixelChannels ...

I did a little digging, the problem seems to be that the coders are being linked into libMagickCore. When libMagickCore-6.Q16.so is linked, the coders are included, and wmf.c uses functions like DrawPathFinish(), which are part of Wand, not Core. Therefore MagickCore programs will not link with ...

This is with an Ubuntu-installed ImageMagick on the system as well, I don't know if that could be a factor. The system one links fine, it's the 6.9.2 I'm trying to build for testing that's not linking. I can't easily remove the system one without breaking a lot of stuff, but I did try hiding the ...