What software should I use to make a poster with a computer? Photoshop is practical and colorful. If you want to be convenient and quick, you can use the combination of online map and offline map of China Material Network for your own use. Photoshop is bitmap software. If your poster is simple, it is recommended to use vector software such as coreldraw and Illustrator. The pictures made by vector software will not have mosaics no matter whether they are enlarged or reduced. It is very easy to use. =A:C=BB >=A:C=A This mode compares the upper and lower layers of pixels and takes the relatively dark pixels as the output. Note that the pixels of each different color channel are compared independently, and a relatively small color value is used as the output result. The lower layer represents the layer with the lower stacking order, and the upper layer represents the layer with the upper stacking order. The following is also not described. Brighten B.