Read And Write Of The Low-level PSD/PSB File Structure
Read And Write Of The Low-level PSD/PSB File Structure is a pixel-based image editing program that is used to process and manipulate raster images. This program is used by photographers and graphic designers worldwide. Photoshop is a comprehensive image processing solution with which it is possible to edit an image in different ways like multiple adjustment layers, color grading, and compositing to name a few.
Once an image is processed in Photoshop, it is necessary to export or save the image for the intended task. Presently there are more than 25 file formats in Photoshop in which a file can be saved or exported. The most common formats are JPEG, PNG, and PDF. In these formats the saved files can be best used for print, web or in any image processing programs for further processing. If the Photoshop document contains multiple layers then the most common format to save this file is .PSD or .PSB format.
PSD file format
PSD denotes Photoshop Document. This is a very common and native format to save a document in Photoshop. A PSD file saves multiple layers and Photoshop specific elements within a document. A PSD document supports various color modes like RGB, SRGB, CMYK, LAB etc. PSD files can be typically opened by many programs within the adobe suite like Elements and Illustrator. It can also be opened in non-adobe products like Corel Paint Shop and GIMP.
The layers, adjustment layers and layer styles can be well organized within layer groups or layer sub groups.
One of the main advantages of using Read And Write Of The Low-level PSD/PSB File Structure is there is absolutely no loss of image quality as there is no compression algorithm involved in saving this format. Further, the image data is saved in layers, so this makes the original image data totally non-destructible.
PSD documents can be large in size depending on the number of processes and layers in a file. The size of a Photoshop document can sometimes run into several megabytes.
PSB file format
PSB is generally a Large Document format in Photoshop. There is a limit to how much data a PSD file can hold. When a Photoshop document becomes too large with too many layers and other adjustments, the program throws up an error message indicating that the document is too large to save. In such a scenario the document can be saved.
as PSB format. Like the PSD file format, PSB also supports all identical features like layers, adjustment layers and layer styles etc.
Difference between PSD and PSB
The size of a PSD file is limited to 2 Gigabytes, whereas an PSB document can be upto 25 gigabytes and a pixel dimension of upto 300,000 by 300,000.
Both formats can save High Dynamic Range images, but in PSD it is limited to 16 bits per channel and in PSB it can save upto 32 bits per channel .
In short a PSD file can save upto 900 megapixels whereas a PSB file can save upto 9000 megapixels image