Hi Richard,
It may also be instructive to confirm the library built correctly
by building and running the IlmImfTest suite. Running IlmImfTest
with "deep" as an argument will run only the deep tests.
The source code of those tests should provide further examples of
how to read/write deep data. The different tests intentionally use
slightly different approaches to read/write data. You might modify
one of those tests to disable the file cleanup, which would
generate a deep file you can read with your own code, and compare
to the known values written into the file.
Are you getting the correct sample counts but entirely incorrect
data? That would suggest you have the pointer-to-arrays pointing
to the wrong memory locations. If some of the values are correct
(e.g. only the first pixel in the image, only the first pixel on
each row, or only the first sample of each pixel) that would
suggest the pointers are correct, but the
yPixelStride,xPixelStride,sampleStride (respectively) values are
wrong.
Try writing a small amount of 32 bit float data (e.g. a 2x2 pixel
image with 1 channel) with compression set to NO_COMPRESSION and
check the file contents in a hex editor: the last 4 bytes of the
file should be the last sample of the last pixel of the last
channel in the file. That might tell you whether you are writing
the file correctly.
On 20/04/18 09:45, Michael Wolf wrote:
Hallo
Richard,
This is a snippet from my simple deep reader (half RGBA, float
Z)- minus all the cleanup.
It was written some time ago as a simple test, but it works
for the purpose. Maybe it helps you find the issue.
--- snip ---
Imf::Array2D< unsigned int > sampleCount;
Imf::Array2D< half* > dataR, dataG, dataB, dataA;
void readDeepExr(const char *filename)
{
Imf::DeepScanLineInputFile file(filename);
const Imf::Header &header = file.header();
dataWindow = header.dataWindow();
displayWindow = header.displayWindow();
width = dataWindow.max.x - dataWindow.min.x + 1;
height = dataWindow.max.y - dataWindow.min.y + 1;
sampleCount.resizeEraseUnsafe(height, width);
Imf::Array2D< float* >dataZ(height, width);
dataR.resizeEraseUnsafe(height, width);
dataG.resizeEraseUnsafe(height, width);
dataB.resizeEraseUnsafe(height, width);
dataA.resizeEraseUnsafe(height, width);
Imf::DeepFrameBuffer frameBuffer;
frameBuffer.insertSampleCountSlice (Imf::Slice (Imf::UINT,
(char *) (&sampleCount[0][0] - dataWindow.min.x -
dataWindow.min.y * width),
sizeof (unsigned int) * 1, // xStride
sizeof (unsigned int) * width)); // yStride
frameBuffer.insert ("Z",
Imf::DeepSlice (Imf::FLOAT, (char *) (&dataZ[0][0] -
dataWindow.min.x - dataWindow.min.y * width),
sizeof (float *) * 1, // xStride for pointer array
sizeof (float *) * width, // yStride for pointer array
sizeof (float) * 1)); // stride for Z data sample
frameBuffer.insert ("R",
Imf::DeepSlice (Imf::HALF, (char *) (&dataR[0][0] -
dataWindow.min.x - dataWindow.min.y * width),
sizeof (half *), // xStride for pointer array
sizeof (half *) * width, // yStride for pointer array
sizeof (half))); // stride for O data sample
frameBuffer.insert ("G",
Imf::DeepSlice (Imf::HALF, (char *) (&dataG[0][0] -
dataWindow.min.x - dataWindow.min.y * width),
sizeof (half *), sizeof (half *) * width, sizeof
(half)));
frameBuffer.insert ("B",
Imf::DeepSlice (Imf::HALF, (char *) (&dataB[0][0] -
dataWindow.min.x - dataWindow.min.y * width),
sizeof (half *), sizeof (half *) * width, sizeof
(half)));
frameBuffer.insert ("A",
Imf::DeepSlice (Imf::HALF, (char *) (&dataA[0][0] -
dataWindow.min.x - dataWindow.min.y * width),
sizeof (half *), sizeof (half *) * width, sizeof
(half)));
file.setFrameBuffer(frameBuffer);
file.readPixelSampleCounts(dataWindow.min.y,
dataWindow.max.y);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int s = sampleCount[y][x];
dataZ[y][x] = new float[s];
dataR[y][x] = new half[s];
dataG[y][x] = new half[s];
dataB[y][x] = new half[s];
dataA[y][x] = new half[s];
}
}
file.readPixels(dataWindow.min.y, dataWindow.max.y);
std::cout << "Done.\n";
// clean up etc...
}
--- snip ---
Cheers,
Mike
--
db&w Bornemann und Wolf GbR
Seyfferstr. 34
70197 Stuttgart
Deutschland
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