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You should use PNG format less than you think

YT 2024-03-25 09:29 tutorial  > Making of  > modeling

Learn when you should take a step away from PNG rendering.

PNG (Portable Network Graphics) and EXR (OpenEXR) are both popular image formats, yet they serve distinct purposes and exhibit notable differences. PNG, a lossless compression format, is widely used for web graphics and digital images. It supports transparency and is well-suited for images with sharp edges or text due to its ability to maintain crisp detail. However, PNG may not be the best choice for high-dynamic-range (HDR) images due to its limited color depth.

In many other cases (rendering textures or final renders without transparency) it can be also a good idea to switch to EXR DWAA. Learn more in the video below.

 

Editors note: you should take this video with a grain of salt though, because there are some things that need to be clarified. Author posted some explanations after releasing the video:

  • The PNG/EXR difference comparison does not show only compression. It shows every difference between the two.
  • Often, TIFF is the preferred deliverable for print.
  • Cryptomattes ought not be lossy. Use ZIP 32-bit.
  • Bit-depth doesn't only double the amount of data; it does so for each channel. So an RGB image with double bit depth increases six-fold in precision, while only doubling in data. Good trade-off.
  • DWAA doesn't store 32-bit information, which is why the sizes are the same in the chart. (Unless the passes are named in a specific way.)
  • EXR doesn't bake in the tone-mapping. If you need that, TIFF is a good alternative to PNG.


Author: YT Editor: Michał Franczak
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