The guideline in mind when creating a mystery book cover design UK to be used on Amazon KDP is that it must adhere to certain dimensions and formatting rules so that the end product is guaranteed to be a professional and quality one.

Key Dimensions:

• eBook Cover: Recommended size is 2560 x 1600 pixels with a 1.6:1 aspect ratio.
• Paperback Cover: The standard trim size for most books is 6" x 9" (15.24 x 22.86 cm), but other sizes are available.
• Spine Width: Depends on the page count (calculated based on paper type).

Formatting Essentials:

• Resolution: Must be at least 300 DPI for sharp printing.
• Color Mode: Use RGB for eBooks and CMYK for print to ensure color accuracy.
• Margins & Bleed: Include a 0.125-inch bleed on all sides to prevent cutting errors.

For authors publishing in the mystery genre, the cover should create intrigue and suspense, using dark tones, bold typography, and captivating imagery. Professional mystery book cover design UK services can help craft a visually stunning and marketable cover that aligns with genre expectations.