JPEG (Joint Photographic Experts Group)➢ Uses lossy compression
(A
lossy compression method is one where compressing data and then decompressing it retrieves data that may well be different from the original, but is close enough to be useful in some way.)
➢ Offers settings of higher or lower compression
➢ Compresses file to make it very small
➢ Ideal for sending images over internet and posting on websites
➢ Will not save 16 bit images or layers
JPEG - JPEG is best for photos when you need to keep the file size small and don't mind giving up some quality for a significant reduction in size. JPEG is not suitable for images with text, large blocks of color, or simple shapes, because crisp lines will blur and colors can shift. Only JPEG offers the options of Baseline, Baseline Optimized, or Progressive.
GIF(Graphics Interchange Format)➢ A compressed file format
➢ Used to save graphics, illustrations, logos etc.
➢ Does not support continuous tone images
GIF - Use GIF for simple Web graphics having limited colors. GIF files are always reduced to 256 unique colors or less and they make very small, fast-loading images for the Web. GIF is great for Web buttons, charts or diagrams, cartoon-like drawing, banners, and text headings. GIF is also used for small, compact Web Animations . GIF should rarely be used for photos.
PSD➢ A Photoshop file
➢ Works in the same way as a TIFF – however you would need to have Photoshop to open the file – therefore it is not advisable
➢ Was used more before TIFFs could save layers.
PSD, PDD - PSD and PDD are Photoshop's native format. Use PSD when you need to preserve layers, transparency, adjustment layers, masks, blending modes, text layers and shapes, etc. The
CAMERA RAW➢ Lossless format
➢ Files are smaller than uncompressed TIFFs
➢ Used by digital cameras to capture and save images
➢ Does not alter the data captured by the CCD (Charged Coupled Device)
➢ Can only open in Photoshop CS
➢ On opening prompts you to correct or alter images
➢ Can change white balance, exposure, contrast, saturation etc.
➢ Can batch process
➢ The professional’s choice – as you are the one making any changes to the image data
➢ Takes longer to process images in photoshop
A raw file is a collection of unprocessed data. This means the file has not been altered, compressed, or manipulated in any way by the computer. Raw files are often used as data files by software programs that load and process the data. A popular type of raw file is "Camera RAW," which is generated by a digital camera. Instead of processing the image captured by the camera, the data is left unprocessed and uncompressed until it is opened with a computer program.
