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fixed bug: opencv read tif file convert Palette color image as grayscale image

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This commit is contained in:
Harvey 2021-10-27 13:52:54 +08:00
parent 9e6c290696
commit af154e3053
2 changed files with 16 additions and 1 deletions
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7
modules/imgcodecs/src/grfmt_tiff.cpp
View File

@ -303,7 +303,12 @@ bool TiffDecoder::readHeader()
result = true;
break;
case 8:
m_type = CV_MAKETYPE(CV_8U, !isGrayScale ? wanted_channels : 1);
//Palette color, the value of the component is used as an index into the red,
//green and blue curves in the ColorMap field to retrieve an RGB triplet that defines the color.
if(photometric == PHOTOMETRIC_PALETTE)
m_type = CV_MAKETYPE(CV_8U, 3);
else
m_type = CV_MAKETYPE(CV_8U, !isGrayScale ? wanted_channels : 1);
result = true;
break;
case 16:

10
modules/imgcodecs/test/test_tiff.cpp
View File

@ -219,6 +219,16 @@ TEST(Imgcodecs_Tiff, readWrite_32FC3_RAW)
EXPECT_EQ(0, remove(filenameOutput.c_str()));
}
TEST(Imgcodecs_Tiff, read_palette_color_image)
{
const string root = cvtest::TS::ptr()->get_data_path();
const string filenameInput = root + "readwrite/test_palette_color_image.tif";
const Mat img = cv::imread(filenameInput, IMREAD_UNCHANGED);
ASSERT_FALSE(img.empty());
ASSERT_EQ(CV_8UC3, img.type());
}
//==================================================================================================