The saved JPG file is 300M+, and the direct reason is that the PSD file itself is of good quality, even far exceeding 300M. For example, poster design, canvas with all kinds of high-definition material pictures, none of which are tens of megabytes or hundreds of megabytes. Therefore, the quality of PSD source files is very high.

2. JPG image quality is too high.

When saving as JPG, a pop-up window will appear in the software, allowing users to select the image quality. The higher the quality of the selected picture, the larger the saved JPG file. Generally, you can choose the image quality of 10, and the saved JPG images have high definition.

3. Image cache accumulation.

When a PSD file is often reused in software, it will directly cause the file to pass through many layers. Although some layers were deleted, many layer caches were accumulated, which further improved the quality of PSD files, resulting in an unusually large exported JPG file.

Extended data:

PS manually change the size

1. Drag the image to be processed directly into ps, then click the file in the upper left corner and click the export option.

2. On the page that appears, click the desired option and save it in the format used by the web for input.

3. Then, after entering, click the default selection in the upper right corner and select jpg with low image quality, that is, the image size is smaller.

4. Finally, adjust the picture quality on the right, adjust the picture size you are satisfied with, and save it. ?