It’s an argument that’s been around for as long as digital photography. Should I edit in 8-bit or 16-bit mode? What are the benefits of one over the other and does it really make any difference at all? In this pretty in-depth video, StyleMyPic walks us through what it means and busts two of the most common myths surrounding bit depth.
It’s an interesting video, going through quite a lot of detail. So, here’s a handy time index for different parts of the video so you can bounce back and forth between the bits that really interest you.
0:10 Introducing Bit Depth/Color Depth/Pixel Depth0:26 Concept of Bit Depth0:47 Bit Depth definition visually explained1:18 Understanding Bits per Channel (BPC) in Photoshop1:54 What exactly are ‘Bits’?2:31 Why 8-bit has a maximum value of 2553:06 Different Bit Depth have different tone/RGB values3:38 Photoshop Bit Depth comparison 1bit B&W/8bit grayscale/8bit RGB/16bit RGB5:17 1st Reason for no visible Difference between 8-bit & 16-bit RGB6:16 2nd Reason for no visible Difference between 8-bit & 16-bit RGB7:25 Spot the Color difference challenge in Photoshop + Human Visibility explained8:11 Why Photoshop shows 255 value for both 8 & 16-bits8:28 Which is Better for retouching – 8-bit or 16-bit8:59 Myth 1 debunked10:06 Myth 2 debunked
The short version is that a greater bit depth in the source images means that there is more colour data available for you to work with. Greater bit depth in the editing stage means that you lessen the risk of destroying colour and tone information during your post-processing and retouching. It’s to help minimise loss. Generally, though, after editing, 8-bit for your final output is usually more than plenty. There are exceptions to putting out 8-bit final files, though. For example, you might be editing for use on a high bit depth wide gamut display that can produce more colours and tones than an 8-bit file contains. Or you might be using a printer that can print outside of the normal 8-bit range to be able to produce smoother tones. But, if you’re using that kind of hardware, you probably already know when it’s practical to put out in 8-bit or 16-bit and likely have a workflow in place. As for the myths… Well, you’ll have to watch the videos to find out about those.
