1. The pixel of the picture you are processing is not high.

2. When processing and saving pictures, the quality setting is too low. (Set the quality to the highest. If you save it directly as jpg, you can choose the maximum quality12; If you save it as a jpg in web format, the quality is set to 10 (that is, 100%).

Pixel and resolution in Photoshop:

1, what is a pixel?

Bitmaps consist of blocks of pixels. Each pixel has its own position and color information. The more pixels an image contains, the more color information it contains, the clearer the picture and the larger the file.

2. What is the resolution (ppi)?

Image resolution is the number of pixels contained in a unit inch, that is, how many pixels can be displayed in a picture. Because the points, lines and surfaces in a picture are all composed of pixels, the more pixels a picture can display, the finer the picture will be, and the more information the same picture can display. The whole image can be imagined as a big chessboard, and the resolution is expressed by the number of intersections of all warp and weft. At a certain picture resolution, the smaller the picture, the clearer the picture. On the contrary, when the picture size is fixed, the higher the picture resolution, the clearer the picture.

Resolution determines the fineness of bitmap image details. The higher the resolution of an image, the more pixels it contains and the clearer the image. At the same time, it will also increase the storage space occupied by files.

Resolution calculation formula:

Resolution calculation formula

Note: a: number of pixels in length; B: the number of pixels in the width; C: The screen size is the diagonal length.

Pixel and resolution are two closely related concepts. It is not difficult to see from the above formula that their combination determines the data amount of the image.

Remedial measures:

1, select high pixel picture as PS editing material. If it is a digital photo, choose HD mode when shooting. If the picture comes from the network, high-pixel high-definition pictures are preferred.

2. When 2.PS was newly built,

The resolution selection is set as required. Although we know that the higher the resolution of the image, the better the quality of the image, but the image with high resolution will occupy a lot of storage space. Therefore, when choosing the resolution of a picture, it is usually set according to the purpose of the picture. For example: printed poster: 300ppi. Posters, photos, inkjet printers, etc. : 100 ~ 150 PPI。 Mobile phone computer webpage picture: 72ppi.

3. When saving the picture,

Select 12 as the high-quality, best and large file, and then confirm to save it.