Galaxy S6 :: Text App Downsizing Pictures

The default Samsung texting app downsizes every picture I send, so much so that it looks like absolute garbage to the recipient (pixelated when viewed full screen on the recipient phone). Is there any way to disable this 'feature' or reduce the amount of compression/downsizing on the GS6 side?

I like to save some pictures sent to me from my friends' GS6's (especially ones taken with the incredible camera on the GS6), and there is no point in saving the garbage that I receive from the Samsung texting app.