I'm trying to write a unit test for some code I wrote that generates one image
from another. In the main app, the source data comes from Open CV as a buffer
of 3 byte-per-pixel elements. My code generates a CGImage. In the unit test, I
load a saved version of one of those images from a PNG file to UIImage, get at
the buffer, pass it to my code, and then compare the result to a saved version
of that same output.
The saved version is a PNG. I load that, and then get the data buffer using
let fiData = fi.dataProvider?.data as Data?
I do a similar thing with the generated CGImage. Then I compare the two
buffers, byte by byte. They are similar, but contain differences (sometimes
more than I would expect). But if I save both as PNG and look at them in
Preview they look identical.
My guess is something's happening somewhere with color correction. In my code,
I make a CG(bitmap)Context, specifying device RGB color space (should that be
generic?). I don't really know what happens to the PNGs I save and load.
Is there a way to ensure the bytes in the buffer are compressed and
decompressed exactly as written?
--
Rick Mann
rm...@latencyzero.com
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