1.Resolution: 300 DPI or 1000 pixels, Color Mode: CMYK 2.File Formats: JPG, PNG, PSD, JPEG, etc. 3.Due to the semi-translucent nature of vellum paper envelopes, the printing will have a semi-translucent effect (no white ink). Full transparency cannot be achieved; 4.It is recommended not to use crease lines as the edge of the design, as there is a risk of misalignment.