For sending out image via e-mail or when saving an edited image you want to get an image with smaller or reasonable file size. Below please find a list of various approaches to reduce an image's file size.
Any graphic program that can save an image can reduce it's filesize. Some ways to reduce the filesize include:
a. Use a different format
Lossless formats like TIFF or BMP are inherantly large, switching to JPEG will greatly decrease the filesize of photographic images.
b. Choose a higher compression level.
If you're using a lossless format and already at the highest compression, you'll have to use a different method. Compression level can be set by clicking the "options" button when you go to save an image.
c. Reduce the dimensions of the image
By cropping or reducing an image, you will reduce the amount of pixels and graphic data in the file. This in turn will reduce the filesize.
d. Reduce the colors of the image.
If you reduce the image to 256 colors or less, or convert it to greyscale, that will again reduce the data and therefore the filesize.
e. Blur the image
You can reduce the size of a photo in JPEG format by blurring or softening the image.
XnView's Export function
The easiest way to get an image at a low filesize and still keep it at an acceptable quality (nearly anything that will reduce the filesize will have an impact on quality (although often it isn't a noticeable one), it's simply an unavoidable fact) is to use the export function of XnView. This will allow you to see the results of using a different format, higher compression, and reducing colors before you actually save the image (cropping and blurring still have to be done before exporting though).
All the above info has been originally posted by Drahken in topic Can you shrink a picture file size?. Thank you, Drahken!
- 'Lossy? Lossless? 256 colors? This is confusing!'
- How to prepare an image for the internet
- How to Batch convert several images at once
- Smaller image has same file size
- Resizing image results in larger file
- What format should I save this image in?
- Common graphic formats