How to cut a stream of pixels into a normal sized picture?

[opti]

Hi - I'm pretty new to ImageMagick and want to do some weird stuff:

I have a huge stream of pixels (100000x1) and wanna cut after x pixels to create a "normal" sized picture - I could do it kinda manually with a lot of scripting - is there a faster way to achieve this goal?

Just a small input sample:

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convert -size 56x1 xc: -sparse-color Barycentric '0,0 rgba(200,0,0, 1.0)  56,0 rgba(255,0,0, 1.0)' test1.bmp

Is this possible? Save it as a raw bitmap, and reload that with different width/height parameters?

Any help appreciated!
Thanks

[fmw42]

I do not know much about streams, but see raw RGB or RGBA formats at http://www.imagemagick.org/script/formats.php. They are both read and writable. So I think you could output as RGB:- and pipe back in with different size and depth arguments

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convert -size 56x1 xc: \
-sparse-color Barycentric '0,0 rgba(200,0,0, 1.0)  56,0 rgba(255,0,0, 1.0)' RGBA:- |\
 convert -size WxH - Other_Processing \
 result.png

[snibgo]

I'm not sure about the "stream" part of your question. If you have an image sized Nx1, you can crop it into lines and append the results. For example, if N=100000 you can get 1000 lines of 100 columns each:

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convert in.png -crop 100x1 -append out.png

[opti]

Thanks a lot to both of you.
I was exactly looking for the solution snibgo provided - works great!

[snibgo]

Correction: I should have put a "+repage" in there, so:

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convert in.png -crop 100x1 +repage -append out.png

Incidentally, the inverse is just as easy. If we have in an image of WxH pixels, we can crop it into lines and append them horizontally to make an image Nx1, where N=W*H.

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convert out.png -crop x1 +repage +append out2.png