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JPEG compression reduces file size by changing the color values and blocking together groups of pixels with a more uniform color, so that it doesn't have to store as many different ones.

In this case, the width is 1920, the height is 1080, and each pixel uses 3 bytes. So, the maximum size of a 1920x1080 image with 3-byte pixels is approximately 6,220,800 bytes, which is equivalent to about 6.22 megabytes (MB). Therefore, your estimate of ~6MB is accurate.

If the pixel dimensions are given, multiply them by each other and the bit depth to determine the number of bits in an image file. For instance, if a 24-bit image is captured with a digital camera with pixel dimensions of 2,048 x 3,072, then the file size equals (2048 x 3072 x 24)/8, or 18,874,368 bytes.

On a PC (Windows 10): If you do not see this, click the View ribbon tab and then Details Pane: You can also right-click on an image & choose properties from the drop-down menu. A new window will appear with several tabs. You'll click the details tab, and there you'll find you image size and dimensions.

Generally, blog images nest well on a website at aspect ratio or 1200px by 630px. Blog images in landscape format are best sized to 1200px by 900px and featured blog images in portrait format are best sized to 900px by 1200px. High-quality images with small file sizes should be uploaded for blog images.

The actual file size depends on the image size and image quality settings selected on the camera. Image quality: This dictates how much compression is used to record the file information. Some digital cameras have a Fine and Standard setting where the Fine setting uses less compression than the Standard setting.

Optimal file size: Large images or full-screen background images should be no more than 1 MB. Most other small web graphics can be 300 KB or less.