How do you reduce a file size of a picture without damaging the quality?

Question

I was making a twitter background in Photoshop CS5, and when I was completed I saved it in JPEG. Then when I went to upload the background on twitter the file size was way to big. Then when I reduced the file, the quality was horrible. How do I reduce the file size without losing quality in the picture?

Thanks!

Answer 1

depends on how you reduce the size.... file size is dependant on several points from bit depth and resolution to 'canvass' sizse...

reducing the canvass size and keeping the dpi and bit depth will reduce the file size and keep the pic quality but will still suck if zoomed in on..

Answer 2

Open the picture either as an original or as a .psd, each time you save an image as a .jpg it degrades the image. If you hold off saving it as a .jpg until you are completely done with it, then sizing it down will actually increase the quality of the picture. Just go into Image- Image Size and check 'Constrain Proportions', this will retain the aspect ratio so you only have to change one field (side), the other field changes according to what you put in the first field.

Answer 3

Make sure the file is RGB not CMYK by clicking: Image>mode>RGB.

RGB (Red, Green, Blue) is used for screen use. CMYK (Cyan, Magenta, Yellow, Black) is used for print.



also change the image size by clicking: image>image size then change the pixel dimensions.

1024 x 768 pixels should be a good size as its the most used screen size at the moment.



I personally would start over again as your current image has probably been messed around too much.



oh yeah and set image to 72dpi



Hope thats all the info you need

Answer 4

Use Microsoft office picture manager go to file go to export and look to the left gives you option on changing file and reducing size

Answer 5

either you increase the compression ratios which reduces resolution, or you reduce the image size