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Image and color basics
Last updated 11/30/2015
A Original dimensions and resolution B Decreasing the resolution without changing pixel dimensions (no resampling) C Decreasing the
resolution at same document size decreases pixel dimensions (resampling).
Quickly display the current image size
If you want to quickly display a document’s current image size, use the information box at the bottom of the document
window.
?
Position the pointer over the file information box, and hold down the mouse button.
File size
The file size of an image is the digital size of the image file, measured in kilobytes (K), megabytes (MB), or gigabytes
(GB). File size is proportional to the pixel dimensions of the image. Images with more pixels may produce more detail
at a given printed size, but they require more disk space to store and may be slower to edit and print. Image resolution
thus becomes a compromise between image quality (capturing all the data you need) and file size.
Another factor that affects file size is file format. Because of the varying compression methods used by GIF, JPEG, PNG,
and TIFF file formats, file sizes can vary considerably for the same pixel dimensions. Similarly, color bit-depth and the
number of layers and channels in an image affect file size.
Photoshop supports a maximum pixel dimension of 300,000 by 300,000 pixels per image. This restriction places limits
on the print size and resolution available to an image.
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