While saving Image with transparent background in PNG file, please change the image color mode to CMYK and ‘Save for Web’. While saving image with full background in JPG file, please save as RGB mode. Image file should be minimum 2500px with 150dpi.
If you would like to design over the whole printable area, we recommend uploading a high-quality image with minimum resolution of 2500 by 3500 pixels. The maximum supported image size is 10 MB.
A good rule of thumb is that big, high-resolution files make the best prints. Now when we say
we're really referring to resolution, not the file's size.
There is a major difference between file size, which is measured in bytes (like megabytes MB) and resolution,
which is measured in pixels. When you’re printing work, it’s the pixels that matter.
When uploading your files to Marpple, we can only accept JPG, PNG and AI. TIFF and PDF files won't work correctly.
Here's an example of images size you might work on.