Within BlackBerry Messenger you can send photos to your contacts. These images sometimes suffer some serious compression once transfered through the BlackBerry network.
However, you can request a higher quality version of the images that are sent to you. In order to accomplish this, you simply press down and hold on the image thumbnail, within BlackBerry 10.
You will then see the following options popup from the right. You’ll see there is an option for ‘Request Higher Quality’. Select this, which will then request from the sender to resend the image, but this time in HQ.