The disclosure provides a method for image processing, including: loading and decrypting an image file to obtain an original image, and saving the original image; shrinking the original image to obtain a pending image with a preset resolution, and saving the pending image; editing the pending image and previewing the pending image in real time; and editing the original image after the real-time previewing. The disclosure also provides a system for image processing. the disclosure can increase efficiency of real-time preview at the time of image editing.