Legacy ImageMagick Discussions Archive

jmac698

I think it's

magick IMG_2021.tiff IMG_2022.tiff -compose difference -composite -fill white +opaque black comp.bmp

Thanks, I'll play with it

jmac698

I found this way to find the same pixels in two images: magick black_ISO6400_1.tiff black_ISO6400_2 -fx "(u==v)?p:0" comp.bmp and I found a lot. Now I have to do something much more complicated, for n images, find any set of 3 pictures where some pixels are the same. Example pic pixel 1 (0...

jmac698

Yes, my bad, I knew that but was tired. However, every answer you give me I learn a lot! Now I wanted to share some images of my new technique, sample by blue noise. Blue noise is a dense noise with no clustering or obvious patterns. It's great for stippling (dithering), and reducing aliasing in 3d ...

jmac698

I'm getting this error; how can I work that?

Code: Select all

magick lighthouse_x4.jpg BlueNoise.gif -alpha off -compose copy_opacity -composite -scale %w/4x%h/4! -alpha off test.jpg
magick: invalid geometry `2048/4x3072/4!' @ error/geometry.c/ParseRegionGeometry/1542.

jmac698

You're right it works

Thanks again.

jmac698

Hi, Thanks for the quick response. The version in IM 7. This is for images, and not just global average. My example showed a 2x2 image, of course I will use much larger ones. Maybe it helps to picture it this way. A mask with noise (white/black pixels), where white pixels sample the image (also can ...

jmac698

Hi, I'd like to sample random pixels with a mask (containing white for sample, black for not-sample), then average those pixels. This would be simple except there's a variable number of pixels to average. Example: picture 31 41 59 26 Mask: 255 0 255 0 Mask step: 31 0 59 0 Average, 4x4: 45 A straight...

jmac698

The high-end program for this is Pixinsight
https://pixinsight.com

For free you can try
deepskystacker.free.fr/
Detect and clean remaining hot/cold pixels:
http://deepskystacker.free.fr/english/u ... osmetictab

jmac698

I believe the problem is, imagine watching a record spin on a turntable, from the side, except the cheap record has it's hole off-centre so it wavers to the side as you watch it spin. One way to fix that is a type of crop that can search the left/right edges for "non-white" and crop at tha...

jmac698

Perfect! The problem pixels are gone now. I like this method as I can bin as many pixels as I want. Because some people at Magic Lantern, CHDK were asking about binning, I made this demo to see how it works in only software. It's usually done in hardware by summing n pixels to a capacitor then readi...

jmac698

I have it working now, basically. It's slower than my first approach; no matter, it's necessary to do it this way to avoid writing out a very long command. 1.http://www.photographyblog.com/reviews/canon_powershot_sx50_hs_review/sample_images/ (under "Sample RAW Images", "1/320s · f/4 ...

jmac698

Good catch! It got me over the hump. I should be able to complete my 'big picture' operation now. Thanks again @fmw42

jmac698

I'm stuck at the moment, this creates my own checkerboard pattern: magick -size 2x2 xc:black -fill white -draw "point 0,0 point 1,1" -write mpr:tile +delete -size 256x256 tile:mpr:tile out.png But following your example, this doesn't let my pixel shine through: magick orange.jpg ^ -size 2x...

jmac698

I have in fact looked at your demosaicing page! I came up with my own way to do it, simplified even. Using http://img.photographyblog.com/reviews/canon_powershot_sx50_hs/sample_images/canon_powershot_sx50_hs_08.cr2 1. Extract mosaic (let dcraw apply camera white balance, autoleveling, and gamma corr...

jmac698

Thanks so much! It was the second answer which I wanted, but thanks for quick response and input as well, @fmw42

I am using this to mask and average Bayer channels, hopefully all goes well, I may have questions later so.

Legacy ImageMagick Discussions Archive

Search found 48 matches

Re: (IM7) Find same pixel in n images

[Closed] (IM7) Find same pixel in n images

Re: [Solved] Average of random samples

Re: [Solved] Average of random samples

Re: Average of random samples

Re: Average of random samples

[Solved] Average of random samples

Re: Filtering Astronomical Images

Re: Correcting Alignment of an image series

Re: [Updated] Demosaicing with superpixels

Re: [On Hold] Demosaicing with superpixels

Re: Demosaicing with superpixels

Re: Demosaicing with superpixels

Re: [Solved] Composite with transparent checkerboard

Re: Composite with transparent checkerboard