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Re^2: Create image from pixel values with Imager

by Anonymous Monk
on May 17, 2022 at 07:40 UTC ( [id://11143934] : note . print w/replies, xml ) Need Help??


in reply to Re: Create image from pixel values with Imager
in thread Create image from pixel values with Imager

Yes I did see Re: How to create and save an image from RGB values (that's where I got the Imager code :^). Was going to mention it too but didn't, to keep things brief. By "scrambled" I mean the image is somehow partially correct, as if every other line is offset or something.

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Re^3: Create image from pixel values with Imager
by kcott (Archbishop) on May 17, 2022 at 08:25 UTC

    Without more information, I can only guess, but it sounds like an off-by-one error. In your OP: "65536 values from 0-254". That suggests a 255x255 square which is 65025 values; a 256x256 square is 65536 values. Do you perhaps want to start with "65536 values from 0-255"?

    Update: s/off-by-error/off-by-one error/

    — Ken

      > Do you perhaps want to start with "65536 values from 0-255"?

      Exactly (but my data doesn't have any 255 value, 254 is highest). I don't think that's the problem because ImageMagick can convert the packed array to an image and it looks good. I don't know much about image formats or binary data. I learned that the array has to be packed like that by digging in this source code for Image::BMP.

        Heres an idea, don't use data option