Step 1: Cut the map.

It can be processed by PS. Will not affect the picture quality. Modify the size of the picture before cutting it.

Precautions:

1, the size of the picture is modified, not the canvas.

2. Remember to lock the scale, otherwise there will be distortion.

4. The length and width of the reduced picture must be larger than the desktop, so that the resolution of the picture displayed on the desktop will not be affected. Don't reduce the ratio by more than 5% at a time.

Step 2: Enlarge the picture.

What I fear most is distortion, sawtooth and mosaic. The enlarged image size and the required image size should not exceed 30%.

PS treatment is also possible, but it cannot exceed 10%, otherwise the quality will be reduced. If it exceeds 10%, some special optimization software can be used to deal with it. Or directly use some software specially designed to enlarge pictures, such as S-Spline 2.2. This kind of software is relatively simple to operate and easy to use. Zoom in, then cut and resize to desktop size.

Attached here is the basic introduction of S-spline 2.2:

S-spline is a tool that can enlarge an image without sawtooth. After decompression and registration, it can be used directly without installation.

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