Check if file is a valid image

Question

I'm using rmagick to manipulate image files. I use the ImageList.new on each file to get started. When I apply this method to an invalid image file I get the below error which interrupts the execution of the script:

RMagick.rb:1635:in `read': Improper image header (Magick::ImageMagickError)

Therefore I would like to be able to check whether a file is a valid image file before using this method.

Any ideas? Thanks.

Answer 1

You can check the format of the image. For example:

image = Magick::Image::read(file_path).first
image.format

So you can check if the format is one of the formats you expect:

image = Magick::Image::read(file_path).first
%w(JPEG GIF TIFF PNG).include? image.format

This is not based on the file name extension. It giess you the actual format of the file.