1. Open the PS software and import the picture to be modified. File-Open shortcut key (Ctrl+O).
2. Select image-image size. Key step: select a limited aspect ratio in the pop-up window, adjust the resolution value, and click OK.
3. If you are not satisfied with the image size, you can change the image size and select the image size in the same way.
4. Then a dialog box will appear, in which you can change the size of the picture, and then click OK. That would be great. Then look at the image size, which is really the same as the original image.
Extended data:
Smart object layer is a new function in Photoshop CS3, a famous image processing software. Right-click the text name of the layer and find the option to create a "smart object layer".
After the smart object layer is enlarged and reduced, the resolution of the layer will not change (difference: after the ordinary layer is reduced, the resolution will change). Moreover, smart layers have the saying of "following", that is, when a smart layer changes, the corresponding "smart layer layer copy" will also change.
If you want to cancel the smart layer, it is similar to the method when you create it: right-click the layer >; Rasterize the layer.
Smart filter, there is a saying of "smart filter" in the filter options. When you create a smart filter, a "smart layer" is automatically created. After the smart filter is created, a sub-option similar to "effect" will be generated under the layer, that is, close or open your eyes to "not show or show" the filter effect of the layer.
In this way, multiple effects can be superimposed repeatedly, and a single effect can be turned off or on. The method is similar to "Mixed Options".
Baidu Encyclopedia-Intelligent Object Layer