Now that we know what bit depth is and how pixels matter in determining what an image file's size is, let us consider an example to understand how to calculate image file sizes. For our example, let us take an image with the dimensions of, say, 640 pixels (width) by 480 pixels (height) at 24-bit bit depth. To determine the pixel count of this image, we multiply the dimensions of the image in pixels. It's just like obtaining the area of a rectangle, but this time with pixels:

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pixel count = width of image in pixels × height of image in pixels

pixel count = 640 pixels × 480 pixels

pixel count = 307,200 pixels

When talking about large numbers of pixels or resolutions, we can often see "MP," which stands for "megapixels." A megapixel is a unit equal to one million pixels. As for our calculated pixel count, we can also say that the image we are considering is approximately a 0.3-megapixel image. Continuing with our calculations, we can then determine the file size of our image as follows:

image file size = pixel count × bit depth

image file size = 307,200 pixels × 24 bits/pixel

image file size = 7,372,800 bits

image file size = 7,372,800 bits × (1 byte / 8 bits) × (1 kilobyte / bytes)

image file size = 921.6 kB (kilobytes)

Please note that our calculated image file size is just an estimate of the actual file size of the image file described. Computer files tend to have other data attached to them, including, but not limited to, the date the file was created, the name of the creator, and so on. But, for now, as an estimate of the image file size, we can say that it is around 921.6 kB. In our example above, we also used the SI decimal system to convert the data size, wherein bytes is equivalent to 1 kilobyte.

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Processing of JPEG photos online.

Resize image in megapixels online

You can still change size in: Pixels | Percents | Megabytes

Select a picture on your computer or , set size in MegaPixels and then click OK. Other settings are installed by default.

The original image is not changed. You will be given other processed image.

1) Select image in JPEG format:

2) Size in MegaPixels: (from 0.01 to 20)

3) Compression settings

Standard JPEG Progressive JPEG

Copy EXIF and metadata? YES NO

Quality (1-100)

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