imread Fails for CV_8UC4 Mat Saved in JpegXL Format Without IMREAD_UNCHANGED Flag #26767
Description
System Information
OpenCV version: 4.12.0-dev
Operating System: Windows 11
Compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.37.32822/bin/Hostx64/x64/cl.exe (ver 19.37.32822.0)
Detailed description
When a cv::Mat of type CV_8UC4 is saved in JpegXL format, the imread function fails to load the image unless the IMREAD_UNCHANGED flag is used.
Steps to reproduce
int main(int argc, char** argv)
{
Mat img(240, 320, CV_8UC4);
randu(img, Scalar(0, 0, 0, 255), Scalar(255, 255, 255, 255));
string fname = "test.jxl";
imwrite(fname, img);
Mat test_img = imread(fname, IMREAD_UNCHANGED);
Mat test_img2 = imread(fname);
return 0;
}
[ERROR:0@0.072] global loadsave.cpp:507 cv::imread_ imread_('test.jxl'): can't read data: OpenCV(4.12.0-dev) C:\projects\opencv\modules\imgcodecs\src\loadsave.cpp:501: error: (-2:Unspecified error) in function 'bool __cdecl cv::imread_(const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &,int,const class cv::_OutputArray &)'
> Internal imread issue:
> 'original_ptr == real_mat.data' must be 'true'
Issue submission checklist
- I report the issue, it's not a question
- I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
- I updated to the latest OpenCV version and the issue is still there
- There is reproducer code and related data files (videos, images, onnx, etc)