frameD automatically creates and stores scaled down versions of the images if required. These are used as proxies or to speed up loading sequences into the frameD editor.
Scaled down images are stored in a sub-directory of the directory where the respective image is located.
The thumbs subdirectory stores images used to speed up loading projects into the frameD editor. This will prevent it from needing to read all original images to create the preview displayed in the editor.
The proxy directories contain scaled down versions of the images used if a sequence is loaded as a proxy.
All of these directories and contained files may be deleted at any time. However, they will be created again if required by frameD.
If the original image changes then the proxy/thumb will be re-created as well if required.
frameD saves 8-bit images as PNGs, HDR images as OpenEXR. In both cases the highest compression rate is used to keep disk usage down. While this slows down writing the images, this only happens rarely. Reading the images will not be affected 1).
Proxy and thumb images are accompanied by a
.xfi file, which is an XML file pointing to the actual image. This is required because frameD doesn't know if it is looking for a PNG or EXR image initially.