Hello, I'm sub-setting a large amount of images to a .evf file. The code works but if the image is not within the .evf boundary then I get an message that say's: Array dimensions must be greater than zero. The message makes sense but it stops the code and I have to manually bypass the images that's not in the .evf boundary. Is there a IDL code that allows me to bypass the images without manually taking out the images in the code? Thanks