256-color image is a term describing a way of storing information in indexed colors. Information about each pixel of the image is encoded in such pictures with an 8-bit byte, which in total is 256 colors. Due to the small amount of information, these images are widely used for posting on the network and exchanging data that do not require high resolution and quality.
Necessary
- - Original image;
- - a personal computer with any version of Adobe Photoshop software installed on it.
Instructions
Step 1
Open the picture in Photoshop. Review the original image color-coding settings. To do this, in the Image list menu, click Mode. In the Russified version of the program, this path looks like this: "Image / Mode". Make sure your picture is not saved in a 256-color palette. It is designated in this list as Indexed Color, in Russian - "Indexed Color". Image options in this list are marked with a check mark. Also, the parameters of the picture are displayed in the upper frame of the open window.
Step 2
To transcode an image into 256 colors, simply select the Indexed Color option you need from the same list. In the window offered below, set the following parameters: Palette: Local (Selective), in the Russian version Local-Selective, Colors - 256. Forced Forced mode can not be selected, leaving None. If the picture is intended for posting on the Internet, select the Web option.
Step 3
Please note that in this menu you are asked to keep the background transparency. If your picture originally had such a background, check the Transparency box. Dither image smoothing is also at your discretion. When all the transcoding options are selected, click the Save button. The information on the window frame will change to “File name @ scale. Index.
Step 4
The file should now be saved. From the File menu, choose Save As. Select the one that suits you best from the offered list of formats. For 256-color images, BMP,.
Step 5
To convert an image to 256-color encoding, you can use the built-in Image Optimization for Web option as follows. Open the picture. Select the Save for Web tab from the File menu. In a separate window, which will display the results of image changes, set the following parameters:.
Step 6
For a picture with a transparent background, check the Transparency checkbox. For each new parameter selected, the result will be displayed immediately to the left of the list. When all the parameters are set and the result suits you, click the Save button. Save the image with a different name so that you have the unmodified original.
