Open paint program in windows click on - Resize shown like below
After click on resize you will get window like below image shown,There is two option Percentage and pixel.. Percentage is used if you what to change your photo size in directly in percentage it means it decrease/increase that percent of image size..
Pixel: It is used generally You can change your image size by pixel..
Maintain aspect ratio; It will be main your original image ratio if you want to give your own input size then deselect sign to which is shown in maintain ratios box
see below images for better understanding
If we use pixel and main ration. and give input 200 pixel horizontal we selected maintain ratio so vertical input automatically changes as per images own ratio..
Output of 200 input horizontal with maintain ratio
With out maintain ratio given input 1000 horizontal no changes in vertical input..we can see it..both input are choose by us only!
Out put for input 1000 pixel horizontal and 150 pixel vertical
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