Checking the size of digital photo files

If you sell digital photo files, their size is important. There are four ways people might assess the size of your files and three of them, frustratingly, are meaningless. To know if a photo can be printed nice and large, only the number of pixels matters. • Size of...

“Invalid JPEG marker” problem

  My very dear friend Raelene sent me a file this morning that wouldn’t open on her Mac.  She was getting this annoying error: “Could not complete your request because and unknown or invalid JPEG marker type is found.” I’d love to blame...

The PNG delusion

Whenever I visit photographers’ websites, I’m often appalled at how slowly they load.  It’s a terrible first impression for a visitor to your site, and maybe catastrophic to your chances of snaring them as a customer.  I have a lovely fast cable...

About resolution

Digital image resolution can be a confusing issue, and there is a great deal of misinformation floating around. This is because there are two definitions for the term “Resolution”. Definition One: Pixel Dimensions The NUMBER of pixels in something. Usually...

Let’s cut Facebook some slack!

This article was last updated in October 2018. Everybody’s complaining It seems that everywhere I turn I see photographers complaining about the quality of their images when posted to Facebook. Yes, we all know that Facebook compresses our images, and yes, it...