I have a question about the command “ximage”. We can use the interactive option “l” to get the average luminance of the selected area in the HDR image. However, since the image is too large to display completely on the screen, so I can’t choose this specific area to get its luminance that is in the center of the image. The HDR image is 5496x3670 pixels while the analysed area is almost 500x400 pixels.
In my opinion, using the command “pvalue” and the masked image to get the RGB values is kind of troublesome. And I used “pcompos” to crop this image and the luminance value is much smaller than normal one. It seems that “pcompos” is not suitable to such a problem. Is there any other efficient solution? Any suggestion is appreciated!