Set preview cache
Lightroom renders three types of previews: thumbnails, screen resolution images, and 1:1 previews. 1:1 previews have the same pixel dimensions as the original photos. All previews are stored in the folder where your catalog is located.
- Choose File > Catalog Settings.
- Choose from the following menus:
- Standard Preview Size Specifies the maximum pixel dimension for the rendered preview. Choose the size that accommodates the display size you're working with.
- Preview Quality Specifies the appearance of the previews. Low, Medium, and High are similar to the upper range of the quality scale for JPEG files.
- Automatically Discard 1:1 Previews Specifies when 1:1 previews are discarded. 1:1 previews are rendered as needed and can make the library preview file large.
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