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Why has my foiling file upload failed?

Why are there errors relating to the file I have uploaded for advanced foiling?

In our file validation for foiling, it is important to remember that the file that displays which areas of your cover you would like to be foiled should be supplied in black. In these files  the black areas represent where you would like the foiling to be.

It is important that the design is submitted in black, not grey as this can cause issues in production.

The following is what will be shown if your files are correct:


If your file contains some pixelation or greyness this will be shown,the X&Y coordinates relate to where the issue is occuring on the file:


If your file contains colours that are not black or white, the following will show: