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| Re: Drawing raw data to an Image / Draw object? [message #18572 is a reply to message #18569] |
Thu, 09 October 2008 14:35  |
mrjt
Messages: 705
Registered: March 2007
Location: London
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Contributor |
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As far as I know there is no Image support for greater the 32-bit depths, since that is the effective limit of consumer display equipment.
But I believe your problem is that the conversion is wrong. I think it should be:
byte quantumToByte(m::Quantum q)
{
// Equivalent to:
// return (q * 255) / 65535);
// or
// return iscale(q, 255, 65535)
return (q >> 8);
}
For correctness I believe you should replace the 8 with '(QuantumDepth - 8 )', but that's really just a guess from the ducumentation.
Alternatively you can #define QuantumDepth to 8 yourself to tell the library to use 32-bit and avoid the conversion. If you're only planning on drawing to the screen this seems like a wise move to also reduce memory consumption.
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