Re: How to create and save an image from RGB values

in reply to How to create and save an image from RGB values

For the records:

We talked about it in the CB and I suggested to create a trivial lossless and uncompressed intermediary raster-image file in a format known to ImageMagick's convert °

But I failed to find a sufficiently easy format or a module helping writing it.

Possible candidates are GIF , TIFF , BMP ...

They all require to pack some non-trivial headers.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

update

°) to be further converted to a highly compressed format

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Re^2: How to create and save an image from RGB values by kikuchiyo (Hermit) on Dec 27, 2021 at 23:52 UTC
How about the PPM format? It's as simple as e.g. "P6 640 480 255\n" followed by the raw RGB binary data. It can be transformed by ImageMagick to any desired format. Alternatively, see the write_to_scalar example in Image::PNG::Libpng.	[reply]
Re^3: How to create and save an image from RGB values by LanX (Saint) on Dec 28, 2021 at 00:59 UTC
> How about the PPM format? Yeah, that's pretty much what I was imagining (no pun intended ;) Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^2: How to create and save an image from RGB values by bliako (Monsignor) on Dec 27, 2021 at 23:49 UTC
Welcome old friend Netpbm / ppm, that's OK but something more efficient (in output file size as well as output file format) is needed. Thanks.	[reply]
Re^3: How to create and save an image from RGB values by LanX (Saint) on Dec 28, 2021 at 00:02 UTC
You didn't say it's such an amount of data, I'm wondering what kind of images you are creating. Charts? Fractals? ° Anyway ... It's been a while since I've worked with `convert` , but IIRC it's possible to compose bigger pics from smaller ones. So you could write out PPM's of small temporary chunks (like stripes of lines) and convert them to your desired compact format and finally glue all parts together. update °) more importantly, how are you able to keep your RGB array in memory if it's too big for the disk? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l]
Re^4: How to create and save an image from RGB values by bliako (Monsignor) on Dec 28, 2021 at 09:30 UTC
Fractals from marioroy's [OT] Merry Christmas and gift of love, it takes less to create a fractal with size 1000x1000 with many iterations and miniscule step-size than writing it out with Imager. A 1000x1000xRGB image is not much LanX! :)	[reply]
Re^5: How to create and save an image from RGB values by marioroy (Prior) on Dec 28, 2021 at 12:39 UTC
Re^6: How to create and save an image from RGB values by bliako (Monsignor) on Dec 28, 2021 at 13:12 UTC
Re^5: How to create and save an image from RGB values by LanX (Saint) on Dec 28, 2021 at 13:47 UTC

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