We have just released a detailed guide on best practices for preparing your photos for printing at Bumblejax.  A portion of the guide will be more geared towards photographers and graphic designers, but it’s worth a read for anyone sending their photos to a print lab.  Every lab will have different requirements, but the tips on file type, monitor calibration, dark prints, etc are good general tips for printing your photos.  Below is a cliffs notes version of the article and you can see the detailed printing guide here. 

Accepted File Types: JPG (preferred), TIFF, PDF.
Max File Size Accepted: 100MB for online orders; unlimited for offline.  Best to send as native resolution (no resizing).
Color Space:  Send as RGB, not CMYK.  The sRGB space is most common.  Adobe 1998 is best if you know what you’re doing.
Bleed: We do that for you.
Color Accuracy: Unless your monitor is professionally calibrated, your print color may not match your monitor.
Avoid Dark Prints: View the photo on your monitor at around 50-60% brightness to better represent a print.
Color Correction/Editing:  We never change color without customer inquiry and approval.  If we feel a photo needs sharpening, denoising or a touch of lightening we’ll take care of it.  Minor editing such as removing red eye we also take care of at no charge.

Link To Detailed Printing Guide.