Maximum resolution and other questions for Facebook

I think not too long ago FB started supporting the upload of higher resolution pictures if you enable the upload of higher quality pictures. However, when I try to upload a picture with a long edge of 960 pixels, I don't see such an option. Does that mean FB would have compressed and resized the photo?

In the past, I know that FB supported a maximum long edge of 720 pixels. I presume that means if I upload a picture that is 720 pixels or less, then FB won't resize the photos and that the uploaded the version should be the same as the one on my computer, bit for bit, right?

Does anyone here know how to replace a photo in the FB albums without losing the comments?

During upload you have to tick the button that says high resolution. I'm pretty sure this is only to enable high resolution downloads. That being said, facebooks compression is shoddy, and I always upload around 720px long edge to maintain sharpness and overall quality. If you upload max resolution and then re download that same image, you will probably notice some compression artifacts.

as for replaceing a photo without losing comments, thats not possible as far as I know.

Take a look at my post in this thread:

https://photography-on-the.net …/showthread.php​?t=1014171

This might possibly give you some insight into what FB is doing (for whatever that information might be worth). Note that based on my quick test it is possible to download images with the long dimension up to 2048 pixels, although the native FB viewer doesn't seem to display anything larger than 720 pixels.

GwagDesigns wrote in post #12051145
During upload you have to tick the button that says high resolution. I'm pretty sure this is only to enable high resolution downloads. That being said, facebooks compression is shoddy, and I always upload around 720px long edge to maintain sharpness and overall quality. If you upload max resolution and then re download that same image, you will probably notice some compression artifacts.

as for replaceing a photo without losing comments, thats not possible as far as I know.

Thanks for the response buddy. So are you saying that as long as I keep my pictures at 720 pixels on the long edge, then FB will not resize or recompress my photos? Bit for bit, it should match the original on my computer right?

Doh! I'm a bit disappointed that I can't replace a photo w/o losing the comments.

Rimmer wrote in post #12051196
Take a look at my post in this thread:

https://photography-on-the.net …/showthread.php​?t=1014171

This might possibly give you some insight into what FB is doing (for whatever that information might be worth). Note that based on my quick test it is possible to download images with the long dimension up to 2048 pixels, although the native FB viewer doesn't seem to display anything larger than 720 pixels.

Thanks for the information. Is it actually confirmed that the FB viewer doesn't display anything larger than 720 pixels?

lsquare wrote in post #12051499
Thanks for the information. Is it actually confirmed that the FB viewer doesn't display anything larger than 720 pixels?

I did the upload and download test but am not familiar with their image viewing options.

lsquare wrote in post #12051493
Thanks for the response buddy. So are you saying that as long as I keep my pictures at 720 pixels on the long edge, then FB will not resize or recompress my photos? Bit for bit, it should match the original on my computer right?

Doh! I'm a bit disappointed that I can't replace a photo w/o losing the comments.

NO...even high res uploads are recompressed. Just accept the fact that facebook sucks for quality photos.

Facebook will always recompress the photos even if they are lighter than 100kb. They will at least not resize them if they are constrained to 720x720 px. So best thing to do is resize them to fit the 720px format, sharpen of course and save with high quality compression and hope for the best by crossing your fingers. Depending on what's on the photo it may look better or worse. Clear blue sky will most likely always get jpeg artifacts..

FWIW thats my .02 on the part of facebook they have not been able to figure out even with their ostensibly best programming talent.