Photoshop File Formats
File FormatDigital images comprise millions of pixels. The different ways they are calibrated and stored are known as File Formats. When Save As is selected, a drop-down menu containing 17 different formats to choose from is presented. Many of these formats are only used in design and reproduction.
The following four are the main formats used in photography.
TIFF (Tagged Image File Format)
This is standard format allowing images to be viewed changed, and saved in most imaging software programs. A "profile" is attached, which holds the digital information required for accurate printing and enables the images size, colors, and contrast to be recognized on another computer. When saving as TIFF, a box open asking which compression is required. Usually, None is selected. However, for e-mailing TIFFs, you can use ZIP or LZW formats without any great quality.
JPEG (Joint Photographic Expert Group)
JPEGs are compressed files that remove pixels to reduce the file size, making them quicker to send as e-mail attachments. The reduction in quality will be noticeable, though selecting Save for Wed from the File menu will produce files of excellent quality. Most digital cameras record files as very large JPEGs that can be converted to and saved as TIFFs.
Photoshop (PSD)
A Photoshop document is similar to a TIFF and is the default setting in Photoshop when images are saved. These documents can also be opened in other computers, and any open layers which will be keep intact, which is not possible with a TIFF.
RAW
Some digital cameras can shoot in a RAW format, which doesn't remove any pixel and so does not compress the file. The files will be larger than JPEGs and require careful processing to get the best quality. RAW is the favored format for professionals, giving them total control over the the digital processing in the same way that making a high-quality photographic print in a conversational darkroom gets the best out of a negative. Images can be saved as Photoshop RAW, but this is only really necessary if you do not know which format the image may be opened in on another computer.
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