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What is the difference between photoshop cs4 and photoshop7? Thank you ~ ~
Ps cs4 (i.e. Creative Suite 4) is ps 1 1, which is much higher than that of ps7, which is relatively old (besides, ps cs5 is also released, which is relatively easy to use, and I use ps cs5).

New features of Cs4:

1. Innovative 3D drawing and composition

With the help of a brand-new ray tracing rendering engine, you can now draw directly on a 3D model, wrap a 3D shape with a 2D image, convert a gradient image into a 3D object, increase the depth of layers and text, realize print quality output, and export it to a supported common 3D format.

Adjusting panel

Simplify image adjustment by easily using all necessary tools, realize lossless adjustment and enhance the color and tone of the image; The new real-time and dynamic adjustment panel also includes image control and various presets.

3. Mask panel

Quickly create and edit masks from the new mask panel. This panel provides all the tools you need to create editable masks based on pixels and vectors, adjust mask density and feathering, easily select nonadjacent objects, and so on.

4. Fluid canvas rotation

Now you can rotate the canvas at will with a little click, and it won't be distorted at any angle-you don't have to turn your head when drawing and drawing.

5. Automatic image blending

With the enhanced Auto-Blend Layer command, you can easily create an image based on a series of photos with different focuses. This command can smoothly blend colors and shadows. Now it extends the depth of field and can automatically correct vignetting and lens distortion.

6. Smooth telephoto and zoom.

With the new smooth zoom and telephoto functions, you can easily locate any area of the image. Use the brand-new pixel grid to enlarge a single pixel while maintaining clarity, and realize easy editing at the highest magnification.

Content-aware scaling

The innovative new content-aware zoom function can automatically rearrange images when you resize them, and intelligently preserve important areas when the images are resized. Make a perfect image in one step, without high-intensity cutting and retouching.

7. Automatic alignment of layers

Create precise composite content with the enhanced Auto-Align Layers command. Move, rotate, or deform layers to align them more accurately. You can also use sphere alignment to create an amazing panorama.

Further depth of field

Merges images with different exposures, colors and focal points (you can choose to keep the hue and color) into color-corrected images.

8. Enhanced dynamic graphic editing

Edit dynamic graphics more effectively with the help of brand-new single-key shortcut keys, and use brand-new audio synchronization controls to synchronize visual effects with specific points in the audio track, so that 3D objects become video display areas.

More powerful printing options

With excellent color management, close integration with advanced printer models and the ability to preview the overflow image area, excellent printing results can be achieved. 16-bit printing support on Mac OS improves color depth and clarity.

9. Better original image processing

Use the industry-leading Adobe Photoshop Camera Raw 5 plug-in to achieve excellent conversion quality when processing original images. The plug-in now provides localization correction, cropped vignetting, TIFF and JPEG processing, and supports more than 190 camera models.

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Improve productivity by enhancing the integration between Photoshop Extended and other Adobe applications (including Adobe After Effects) that you rely on? 、Adobe Premiere? Professional edition and Adobe Flash professional edition software.

Industry-leading color correction

Experience greatly enhanced color correction and redesigned dodge, deepen and sponge tools, and now you can intelligently preserve color and tone details.