The option "No deletion of image metadata" turns off the data cleaning and keeps all the metadata stored in the image. In its original settings, the Optimus plugin removes all meta information from the image in order to ensure the most efficient image optimization possible. Quite a practical feature for photographers. This way it is ensured that the generated preview images (=thumbnails) also inherit the parameters stored in the original photo. Thumbnails that are created by WordPress from uploaded pictures with available meta information also contain the metadata of the original image. It is recommended to remove metadata from images. Photos that were taken using a digital camera or processed with an image editing program contain a set of meta information such as exposure time, device properties, copyright information and so on. Metadata, copyright information and geodata remain stored in the image. This way, an original image uploaded to WordPress really remains untouched - untreated, but also unoptimized. When this option is activated, the plugin only compresses preview images (=thumbnails) and always skips original images. The function "No optimization of original images" stops Optimus from optimizing original images uploaded to WordPress. Optimization of original images in WordPress In this context we recommend the WordPress plugin Display Registered Image Dimensions, which lists thumbnail sizes registered by third party applications. The question is: do all image sizes have their purpose? Maybe the theme does not use preview images and always displays the original images? If that is the case and only certain thumbnails are employed in the theme, unnecessary image size settings should be removed from the WordPress settings. Additionally, Optimus has to optimize all of these images as well. The transfer process when media is uploaded becomes slower the more image variants have to be created. The purpose of this list: to have control over the registered image sizes/thumbnails and achieve better performance when uploading. In version 1.3.2 or higher, the WordPress plugin Optimus shows a list of registered image sizes that are created by WordPress and thus optimized by Optimus depending on the file size with each image upload (yes, Optimus optimizes all thumbnails of an image as well, not just the original file). Over time, a large number of custom-set image sizes can accumulate, causing the uploading and optimization processes to slow down due to the large number of preset image sizes.
Themes and (some) plugins additionally create their own image sizes in order to use them in the blog.
In the settings of the WordPress media library, users have the option to set their own custom image sizes (preview images = thumbnails). Compression of thumbnail images in WordPress This article focusses on the Optimus settings available directly within the WordPress plugin. There are various settings in Optimus that aim to help accommodate your image optimization needs and provide the best quality of image optimization.
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