File size about monitor resolution, File size, About monitor resolution – Adobe Photoshop CC 2014 v.14.xx User Manual
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Pixel dimensions equal document (output) size times resolution.
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.
About monitor resolution
Your monitor’s resolution is described in pixel dimensions. For example, if your monitor resolution and your photo’s pixel dimensions are the same
size, the photo will fill the screen when viewed at 100%. How large an image appears on-screen depends on a combination of factors—the pixel
dimensions of the image, the monitor size, and the monitor resolution setting. In Photoshop, you can change the image magnification on-screen,
so you can easily work with images of any pixel dimensions.
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