How do you guy make a photo that with a resolution exactly 600 x 600 ?
I've taken a picture in a shop today, and told them my requirement,
it's turn out they are not making a even sided picture,i.e. 1498 X 1602 , and the size is only 235 kb .
Is that I should chop the photo myself with photoshop ?
Yes, you can crop it. There is a preset square in Photoshop, you have to use the regular, rectangular tool to crop, and while making the selection, hold down the shift key. This will change the rectangular shape into a perfect square one. Then you go to image > image size. There you can adjust the pixels. Make sure you only reduce image size. Blowing up the image will result in visible pixels, which is not acceptable for entry. Also make sure you have selected a perfect square (i.e. the image should have the same height and width). Otherwise, image proportions may not be maintained, resulting in a stretched image. Good luck!