Since [1] when webp support was introduced, pre-converted images (resizes and jpgs) are automatically created so that the images can be used in PDF reports. This only needed to be done for image fields - which can be referenced in reports. This commit limits the pre-conversion of images to images that are set in image fields. [1]: https://github.com/odoo/odoo/commit/0449fe85cb0e1d639a4e1aeba26e90906f79254d task-3510621 closes odoo/odoo#137109 X-original-commit: cd0164339e5179177aaaf21b69615a71a8982da8 Signed-off-by: Benjamin Vray (bvr) <bvr@odoo.com>