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Support for setting TIFF DPI info in imwrite

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This commit is contained in:
Rajkiran Natarajan
2018-04-04 21:20:16 -07:00
parent d294e9d62a
commit 4668836071
2 changed files with 17 additions and 0 deletions
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modules/imgcodecs/src/grfmt_tiff.cpp
+14
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@@ -748,9 +748,13 @@ bool TiffEncoder::writeLibTiff( const std::vector<Mat>& img_vec, const std::vect
// defaults for now, maybe base them on params in the future
int compression = COMPRESSION_LZW;
int predictor = PREDICTOR_HORIZONTAL;
int resUnit = -1, dpiX = -1, dpiY = -1;
readParam(params, TIFFTAG_COMPRESSION, compression);
readParam(params, TIFFTAG_PREDICTOR, predictor);
readParam(params, IMWRITE_TIFF_RESUNIT, resUnit);
readParam(params, IMWRITE_TIFF_XDPI, dpiX);
readParam(params, IMWRITE_TIFF_YDPI, dpiY);
//Iterate through each image in the vector and write them out as Tiff directories
for (size_t page = 0; page < img_vec.size(); page++)
@@ -817,6 +821,16 @@ bool TiffEncoder::writeLibTiff( const std::vector<Mat>& img_vec, const std::vect
return false;
}
if (((resUnit >= RESUNIT_NONE && resUnit <= RESUNIT_CENTIMETER) && !TIFFSetField(pTiffHandle, TIFFTAG_RESOLUTIONUNIT, resUnit))
|| (dpiX >= 0 && !TIFFSetField(pTiffHandle, TIFFTAG_XRESOLUTION, (float)dpiX))
|| (dpiY >= 0 && !TIFFSetField(pTiffHandle, TIFFTAG_YRESOLUTION, (float)dpiY))
)
{
TIFFClose(pTiffHandle);
return false;
}
// row buffer, because TIFFWriteScanline modifies the original data!
size_t scanlineSize = TIFFScanlineSize(pTiffHandle);
AutoBuffer<uchar> _buffer(scanlineSize + 32);