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Make sure to take alpha into account when computing PSNR
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@ -80,9 +80,11 @@ double Image::ComputePSNR(const CompressedImage &ci) const {
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const unsigned char *pixelDataRaw = m_PixelData + i;
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const unsigned char *pixelDataRaw = m_PixelData + i;
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const unsigned char *pixelDataUncomp = unCompData + i;
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const unsigned char *pixelDataUncomp = unCompData + i;
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double dr = double(sad(pixelDataRaw[0], pixelDataUncomp[0])) * wr;
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double rawAlphaScale = double(pixelDataRaw[3]) / 255.0;
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double dg = double(sad(pixelDataRaw[1], pixelDataUncomp[1])) * wg;
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double uncompAlphaScale = double(pixelDataUncomp[3]) / 255.0;
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double db = double(sad(pixelDataRaw[2], pixelDataUncomp[2])) * wb;
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double dr = double(sad(rawAlphaScale * pixelDataRaw[0], uncompAlphaScale * pixelDataUncomp[0])) * wr;
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double dg = double(sad(rawAlphaScale * pixelDataRaw[1], uncompAlphaScale * pixelDataUncomp[1])) * wg;
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double db = double(sad(rawAlphaScale * pixelDataRaw[2], uncompAlphaScale * pixelDataUncomp[2])) * wb;
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const double pixelMSE =
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const double pixelMSE =
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(double(dr) * double(dr)) +
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(double(dr) * double(dr)) +
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