Question

I’m using the Facebook SDK to allow users to share content through my app to their Walls. Its a pretty standard set-up with the Facebook SDK where a typical post will contain some text as well as an image to accompany the post.

This all works fine, but my problem is that since Facebook resizes and converts the images as they see fit, the post images look a bit pixelated when viewed on a Retina display. Does anyone know whether there is a way to ensure that Facebook uses a higher quality image for this?

Again, to clarify, the original images I’m using are high enough quality, but Facebook degrades them a little too much, and they end up not looking too good on a Retina display. Can we avoid this in some way?

Below is an excerpt from the pretty standard Facebook post code I’m using;

NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                   sharingURL, @"link",
                                   sharingTitle, @"name",
                                   @" ", @"caption",
                                   description, @"description",
                                   actions, @"actions",
                                   picture, @"picture",
                                   nil];

[facebook dialog:@"feed" andParams:params andDelegate:self];

Note that the images I’m linking are roughly 250x250px JPGs, if that helps.

EDIT:
Added a sample image to clarify what I mean. I’m trying to see if there’s a way to ask Facebook to use a high-res image for retina displays here.

Thanks in advance!

Answer 1

You could update your Photo in the user’s photo albums. This will also result in a wall post. (If that also fits in your case.) That would be the code:

// save image as data
UIImage* image = [...];
NSData *imageData = UIImageJPEGRepresentation(image, 0.8);
[params setValue: imageData forKey: @"source"];

// send post request
Facebook* facebook = [...];
[facebook requestWithGraphPath: @"me/photos" andParams: params andHttpMethod: @"POST" andDelegate: delegate];

(Note: Uploaded images for the albums must be smaller than 960px on each side. see: Facebook Documentation)