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Image quality. You have the choice between two of the major file formats: JPEG and PNG. Both are well established among browsers. JPEG has a good compression ratio, but can result in visible artifacts. PNG's compression algorithm is not as good as JPEG's, but there are comparatively fewer visible artifacts; nonetheless, older browsers might not recognize this format.
Choosing between one or the other is often a matter of taste. That being said, JPEG remains the recommended choice. If you would rather prevent information loss because of a format change, choose the second option, "Use PNG only if the base image is in PNG format".Warning PNG format is not compatible with the "Watermark" module.
- JPEG quality. Do not choose anything below 80 or at worst 75, for fear of visible compression artifacts.
- PNG quality. Do not choose anything over 6 or at worst 7, for fear of visible compression artifacts.
Product images
- Image generated by. This feature allows you to position the product image in its pre-established space:
- Choose "height" in order to fill the frame height (the width is then recalculated to maintain the same height/width ratio as in the file of origin).
- Choose "width" so that the image fills the width of the frame (the height is then recalculated to maintain the same proportion).
- Choose "auto" so that the width and height are calculated to maximize the space it can occupy in the frame.
- Maximum size of product pictures. Your customers can upload pictures for customized products. By default, PrestaShop sets this value to the PHP maximum setting – this can mean several megabytes: for instance, 8,388,608 bytes means 8 Mb. You can expand this value if necessary, but make sure that your PHP installation is able to take file uploads of this size.
- Product picture width. By default, customers can upload image with a maximum width of 64 pixels.
- Product picture height. By default, customers can upload image with a maximum height of 64 pixels.
- Use the legacy image filesystem. Only change this setting if you have moved the images folder from its default location.
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- Change the image size settings in the table at the top of the "Images" preference page.
- Select which content's images should be regenerated.
- Indicate whether the previous thumbnails should be kept or not.
- Click "Regenerate thumbnails".
Warning |
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Manually-uploaded thumbnails will be erased and replaced by automatically-generated thumbnails. |