Traditional Culture Encyclopedia - Photography major - Basic knowledge of post-processing of photography

Basic knowledge of post-processing of photography

Lead: Post-photography is a photography assistant technology that can subvert the previous photography. It can also be said that digital photography has been gradually recognized by the majority of photographers since its development. From the initial confusion of post-photography, we can now achieve various operations beyond traditional photography through the operation of PS. Let's study together.

?

Comparison of basic knowledge of post-processing of photography before and after adjustment

What kind of photos are easy to adjust?

Photos with small contrast, low sharpness and low saturation are better adjusted. After the camera is taken, everything in the photo is high, so we have no room for adjustment, and the fine-tuning is excessive. And don't set the camera too high. Like the sharpness and saturation in the camera, try to adjust it to? 0? The stage is convenient for post-production. Canon users usually feel that the photos are biased? Gray? But this gray color is actually not a bad thing. What are the photos taken with a Canon camera? Low contrast, low saturation and low sharpness? On the contrary, it is convenient for later adjustment and will not be excessive.

There are also RAW format files, which belong to the original uncompressed files and retain all the light information. Later, you can adjust the color temperature correction, exposure adjustment, sharpness and so on. This is a very good image file. Most importantly, it means that we spend less money to buy high-quality lenses, just as lenses can be adjusted in Canon DPP software? Ambient light quantity, color difference, distortion? Make corrections, so that the errors and bad effects of lens imaging can be corrected before photo adjustment. This is equivalent to buying a higher quality lens.

First, the basic steps of PHOTOSHOP CS5 photo adjustment

1。 Basic operation

Open image:

(a) Press Ctrl+O key at the same time to pop up a browsing window, from which you can select the adjusted image.

(b) Find the image, click the left mouse button and drag it to the ps icon at the bottom of the display. After the interface pops up automatically, move the image to the interface and release the left mouse button when a plus sign appears. To open multiple photos, you need to select multiple photos at the same time, such as method A and method B..

2。 Close the image: Press Ctrl+W or click. ? At the top of the image. Do it. Close multiple Ctrl+Alt+W to close all documents.

3。 Image cropping: When you press the C key, you can crop the picture. In the process of cutting, you can adjust the four sides at will and press Enter to determine the cutting ratio. When cropping, if you want to crop according to the current frame proportion, you need to hold down the Shift key and draw the cropping area with the mouse. When the selection is complete, you can release the Shift key. If you are not satisfied with the cutting during the operation, you need to cut again, and press Esc to cancel the current operation.

Picture editing

4。 Return to the last operation: If you are not satisfied with the last operation, you can use the shortcut key Ctrl+Z to return. If you want to return to multiple steps, you can use Ctrl+Alt+Z to return, and click the Z key several times to return to multiple steps.

5。 Enlarge and reduce the picture display: press Ctrl++ to enlarge at the same time. The more times you press the+sign, the greater the magnification. Press Ctrl+ to zoom out at the same time. The more times you press the-sign, the smaller the scope will be.

6。 Move image: Space bar+drag to move image. After the image is enlarged, you need to hold down the space bar and click the left mouse button to move the image to select the display area.

Second, image adjustment.

1。 Defines the black and white color of the image.

The black-and-white relationship of most images is not clear or accurate when shooting, so the images will appear gray and the color reaction is not true. Therefore, when adjusting an image, the first step is to define the black-and-white relationship of the image. Use Ctrl+L key to open the color scale control interface, and the image light quantity information display control interface (similar to histogram display) appears. From left to right, there are three triangles under the light quantity information in the interface, which are used to adjust the image brightness relationship. The control key on the left is the adjustment black button, with gray in the middle and white on the left. When defining black and white, hold down Alt, click the triangle on the left with the mouse and move it to the right, and the image will become completely white. During the movement, black pixels will appear in the picture, just when zero stars appear. When defining white in the same way, hold down Alt and use the right triangle of the mouse to move to the left, and then black pixels appear sporadically.

Adjustment of black and white color scale

2。 Image contrast adjustment

When the image is black and white, the contrast of the image needs to be adjusted. Contrast will make the image brighter. At the same time, press Ctrl+M to open the curve adjustment interface. The curve is a straight line from left to right. Brightness is related to tone adjustment in the same way. The dark area is on the left, the bright area is on the right, and the gray area is in the middle of the line. Pointing at the lower area of the line with the mouse and dragging it down will deepen the color of the dark part of the image. Pulling up the upper middle area of the line with the mouse will brighten the bright part of the image, and pulling up or down the middle will brighten or darken the image evenly.

3。 Image color control

General image adjustment only adjusts the saturation option. When the saturation is not adjusted, the display is 0, and when the left limit is adjusted to-100, the image is displayed in black and white. Too high saturation adjustment will also lose the picture level and information.

4。 image sharpening

Click the filter option on the PS navigation bar, click Sharpen in the drop-down menu, and then click USM Sharpen in the drop-down menu. The USM sharpening window pops up, and the three options are adjusted to: quantity 50, radius 1.0, and click OK after the threshold is 0.

Sharpening treatment

Third, image storage.

1。 Image saving: After image adjustment, you can save it with CTRL+S.

2。 Save pictures as: Most pictures are adjusted because they don't want to destroy the original data, so saving as is a better method. At the same time, press Ctrl+Shift+S to copy and save.

3。 Network format storage: press Ctrl+Alt+Shift+S+Web copy storage key at the same time to open the network format compression interface. Sometimes because the file is too large, you will be prompted in advance that the image cannot display the window. At this point, you can enter by selecting OK. When compressing, just change the pixel of the longest side of W or H (width and height) at the bottom right of the interface to 1600. Click Enter to preview the image on the left, which will prompt you for the compressed file size. This option compression will not affect the display quality of the image, and the file size will be reduced.

Image output