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What is an image file size?

Images are composed by several dots called pixelsand each of them has a colorrepresented as a combination of three basic colors (redgreen and blue). To store each of these pixels3 bytes (24 ones or zeros) are generally used. When an image is largeit may have millions of pixelsand that means storing all information for an image like that in a computer or any device will take millions of bytes.

When a camera or cellphone says it takes 10 megapixels photosit means that each photo has 10 million pixels (mega = million). And having 10 million pixels means it takes 30 million bytes (or 30 megabytes) to store that photo (which is a lot of space!). If you want to send this photo (or many photos) to a friend by e-mailit will have to transfer 30 megabytes of data and it will take a while to upload it and a lot for the recipient to download it later.

How can I reduce my image's file size?

One way is compressing the imagewhich reduces file size without having to resize it. Image quality will suffer as you increase compression and start losing more data.

Another method is to resize your photodecreasing the pixels it takes to store the image. Reducing image size doesn't reduce image qualityalthough it may lose small details.

Photos from modern cellphones and cameras usually have over 6 million pixelswhile most cellphonestabletsnotebook or TV screens have only about 1.5 million pixelswhich means you end up seeing a resized version of the image (you only use the full image if you print it). So if you resize your imagedecreasing its width and height to a halfyour image would have about the same number of pixels as the screens that will display itand you wouldn't be losing any quality or detaileven looking at your image in full screen mode.

If you have a huge photowe recommend resizing it to about 1900 by 1100 pixelswith JPG format and 90% quality. You will get a versatile image with great qualitythat you can send to anyone without taking too much time.