Eight methods and ideas for cutting out images in Photoshop CS3

One channel cutout method
The channel should be used in combination with the mask. The suitable image type is a simple background and the contrast between the main object in the image and the background is relatively large. The advantage is that it can handle details very well and is more suitable for picking out hair, feathers, etc. Since the color of the image changes a lot, the scope of application of mask cutout is still relatively small. It can be used in combination with other ordinary cutout methods to take advantage of its ability to handle details!
Two-layer blending mode combined with channel cutout method
It is a crazy and complicated way to cut out images. Although it is very complicated, the effect is very good, but the scope of application is too narrow (currently). This method is used to cut out a simple gradient color on a simple background (this is definitely narrow enough!), but it is good for those who don’t want to redraw again. For this "very simple" cutout method, it is easy to think of the "Color Range" function in the selection menu. If you adjust the value to the maximum and then select it, won't it be deducted? The answer is no! When a transparent gradient is placed on a colored background, the color of the transparent part will mix with the background color to produce a new color. For example, if a blue gradient is placed on a yellow background, the middle part of the blue gradient will become blue-purple. Therefore, adjusting the value of the color range to the maximum can only select the blue color that turns into bluish-purple. The final effect is not what we want!
Three "extraction" cutout methods
It is a more intelligent way to cut out images, but even if it is smart, it still cannot guess what we want to leave behind, so it is also more suitable for objects with relatively simple backgrounds. Of course, because it is smart, it is better than channel cutout. The applicable scope of the picture is wider, and it is better at cutting out objects with small projections!
Four color range cutout method
It is more suitable for objects with high contrast, and it is most suitable for cutting out patterns composed of monochrome (or similar monochrome).
Five-mask cutout method
It follows the principle that black areas are transparent and white areas are opaque, so many of the above methods use it.
Six Ctrl+Shift+Alt+`" cutout method
It seems that the row of numbers and symbols above the alphabetical keyboard can become part of the shortcut key (for win systems)! The method of pressing four keys together should be regarded as the ultimate Photoshop secret. Select the shortcut key for a bright color (like a white field). Strictly speaking, it should not be considered a cutout method, but the effect is not bad!
Seven Pen Cutout Method Lasso Cutout Method

Eight magic wand cutout method