1. Joint Photographic Expert Group (JPEG) :
Since June 1982, Working Group 8 (WG8) of ISO has been working on standard for the compression and decompression of still images. In June 1987, ten different techniques for coding color and gray-scales still images were presented. An adaptive transformation coding technique based on Discrete cosine Transform (DCT) achieved the best subjective results.
PEG applies to color and gray-scaled still images. Video sequences can also be handle through a fest coding and decoding of still images, a technique is called Motion JPEG.
2. Photoshop Document (PSD) :
PSD stands for “Photoshop document”It’s an application-specific proprietary format, but because of Photoshop’s dominant position in the pixel-editing world, PSD had become something of a quasi-standard. A number of other programs, even some that don’t cone from Adobe, support PSD as an additional file format-but usually as read-only or for import/export purpose, not as their true native file format.
Difference between JPEG and PSD :
|1.||JPEG is the actually a standard format that is not tied to any application. Virtually all programs that deal with images are able to open and save in the JPEG format.||PSD is the native file format for a Photoshop. In PSD, you only have Photoshop that can open the file.|
|2.||It is a standard image format.||It is the document format for Photoshop.|
|3.||It can be viewed in a lot of applications.||It can not viewed in a lot of applications.|
|4.||It does not support layers.||It supports layers.|
|5.||It is supported by gadgets.||It is not supported by gadgets.|
|6.||It is less longer then PSD.||It is lot larger than JPEG.|
|7.||A JPEG is just a compressed bitmap.||while a PSD is PhotoShop file and thus retains all the project information such as the layers and history.|
|8.||It is compressed single layer image.||It is PhotoShop Document. It is an image with the editing layers saved with it.|
|9.||It is less popular photo editing software.||It is very popular photo editing software.|
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