Logo size should not reduce after uploading - Drupal 7 I have had uploaded a logo in my site.

After uploading the image's size is reduced. Because of that, image quality is decreased and it doesn't look good.

What should I need to do TO NOT REDUCE THE SIZE OF THE LOGO after uploading.

I'm uploading via admin/appearance/settings/theme_name and using "Upload logo image" option

In admin/config/media/image-toolkit the JPEG quality is 75%. I made it 100%, still it doesn't work.

Any suggestions or advices will be helpful...
Don't use "Upload icon image", that's for favicon. Use "Logo image settings" -> "Upload logo image".

I tested this theme and both logo and favicon work perfectly. Logo is not altered in any way and favicon works, no matter what size.