Psd file what is

File Header The file header contains the basic properties of the image. Do not try to read the file if the signature does not match this value. Do not try to read the file if the version does not match this value. Supported range is 1 to Supported range is 1 to 30, Supported values are 1, 8, 16 and Color Mode Data Section The color mode data section is structured as follows: Length Description 4 The length of the following Color data variable The color data Color mode data is available only for indexed color and duotone as defined by the mode field in the File Header section.

Image Resources Section The third section of the file contains image resources. Length Description 4 Length of image resource section. The length may be zero. Variable Image Resources Image Resource Blocks Image resources are used to store non-pixel data associated with images such as pen tool paths. Variable Name: Pascal string, padded to make the size even a null name consists of two bytes of 0 4 Actual size of resource data that follows Variable The resource data, described in the sections on the individual resource types.

It is padded to make the size even. Image resources use several standard ID numbers. Layer and Mask Information The fourth section of a Photoshop file contains information about layers and masks such as number of layers, channels in the layers, blending ranges, adjustment layer keys, effects layers, and mask parameters.

The arrangement of Layer and Mask section is as follow: Length Description 4 Length of the layer and mask information section. PSB length is 8 bytes. Variable Layer info Variable Global layer mask info Variable Series of tagged blocks containing various types of data. Layer Info The following table shows the high-level organization of the layer information.

Length Description 4 Length of the layers info section, rounded up to a multiple of 2. If it is a negative number, its absolute value is the number of layers and the first alpha channel contains the transparency data for the merged result. Variable Information about each layer. See Layer records describes the structure of this information for each layer.

Download Now Learn More. PSD stands for Photoshop Document, which is an image format that supports layers of graphics in a single file. It is mostly used for working with layers of graphics and saving the projects that can extend up to 2 gigabytes in file size. Widely used by graphics designers and multimedia producers as graphics templates, PSD format offers great enhancing features.

Unlike other image formats, it can hold layers with masks, transparency, text, alpha channels and spot colors, clipping paths and duotone settings, which offers varied functionality. Although this format is native to Photoshop, it is equally applicable for editing with Corel Painter.

You can modify PSD layers and other elements such as images, shapes, text, and effects. When you are ready to publish the image, you can export it to standard image formats such as. JPEG ,. GIF , and. The Photoshop file format is separated into five major parts: File Header - contains the basic properties of the image such as the version, number of channels in the image, number of bits per channel, pixel height and width of the image, and the color mode of the file bitmap, grayscale, RGB, CMYK, Multichannel, indexed, duotone, and lab.

Color Mode Data - specifies the length of the color data, which is set to 0 unless the color mode is indexed or duotone as specified in the file header. If this is the case, the indexed color and duotone image color data are also stored in this section. Image Resources - specifies the length of the image resource section and the image resources, which is a series of blocks, each with a resource ID that indicates the type of data stored in the block.

These blocks store non-pixel data associated with the image, such as pen or pencil tool paths. Layer and Mask Information - contains information about layers and masks, which includes the number of layers, channels in the layers, blending ranges, adjustment layer keys, effects layers, and mask parameters. Image Data - contains the actual image data and the data compression method and the image pixel data.