I would like to start converting Bitmap images.
So far, with Marti's help, I have been perfectly content with converting
single pixel values, from RGB to RGB, from RGB to Lab and so on.
But converting entire images is a different kind of challenge.
The example on Page 10 of LittleCMS2.6 tutorial does not specify the
consequence of passing different data types to the library.
It only list the function call with its parameters :
> cmsDoTransform(hTransform, YourInputBuffer, YourOutputBuffer,
YourBuffersSizeInPixels);
So far, Input and Output buffers in my function call were arrays of double :
double[] input = { 0, 0, 0, 0 };
double[] output = { 0, 0, 0, 0 };
This is my function call :
> cmsDoTransform(xform, input, output, 1);
But now, my Input and Output buffers can no longer be declared this way?
In C#, I use :
IntPtr InputBufferPointer = ImageData.Scan0; <---- The 'Scan0' property
comes from the Bitmap data object and indicates the address of the first
scanline
So my new cmsDoTransform call looks like this :
> cmsDoTransform(xform, InputBufferPointer, OutputBufferPointer,
NumberOfPixelsPerScanLine);
The only question I have is what happens to the type of data passed to
cmsDoTransform?
The Bitmap data is copied into an array of BYTES :
byte[] imagePixelsValues = new byte[bytes];
// Copy the RGB values into the array
Marshal.Copy(InputBufferPointer, imagePixelsValues, 0, bytes);
Does the compiler know to automatically cast the byte values to doubles? Or
is that done by LittleCMS?
I am confused...
/ Roger Breton
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