Author Topic: PSJR Reading pixels values from image  (Read 260 times)

Offline dave_galera

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PSJR Reading pixels values from image
« on: 2019 July 31 10:58:04 »
Hi,

I am playing with PSJR and want to scan an image pixel-by-pixel, process the pixel value and then create a new image with the processed pixel values.

I am using this to read line to read the pixel values from the source image:
        target_img.setSample( parseFloat( r_value ), x, y, 0);
        target_img.setSample( parseFloat( g_value ) ), x, y, 1);
        target_img.setSample( parseFloat( b_value ), x, y, 2);

I am reading the source image pixel value using the line:
        source_img.sample(x,y)

BUT......this only returns a single value like 0.12549019607843137, so my question is how do I get the distinct R, G and B values using the sample() method as there is no way to specify which channel the sample is refering to, or exactly is this value for an RGB image.

I have looked in the documentation, on the web and in other scripts but cannot find the answer, I am probably approaching the problem from the wrong direction so any help would be appreciated.

Thanks in advance.....
Dave

Offline dave_galera

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Re: PSJR Reading pixels values from image
« Reply #1 on: 2019 July 31 12:42:54 »
OK think I have sorted it, sample has a channel parameter i.e. sample(x,y,c)
Dave

Offline Niall Saunders

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Re: PSJR Reading pixels values from image
« Reply #2 on: 2019 August 01 13:26:14 »
Check my Batch DeBayer script for MeadDSI i cameras (frim many years ago) - specifically the comments that I added throughout.

Even if the code is no lonfer appropriate, those comments may help you to develop your own PJSR iideas.
Cheers,
Niall Saunders
Clinterty Observatories
Aberdeen, UK

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