Editing Azure Blob Storage Image Bulk Optimization

<br>This script bulk optimizes the file size of all PNG and JPEG image files in an Azure blob storage container in a single execution. After the script is run, all image blob files in the target container will be processed into an optimal, minimal file size without loss of quality by using [https://www.travelwitheaseblog.com/?s=standard%20compression standard compression] utilities. Azure blob storage can be used to host publicly-accessible images for websites in Azure Web Apps or elsewhere. For example, all images on this page reside in Azure blob storage and have been optimized using this script. One of the many ranking factors Google, Bing, and other search engines reportedly use for search engine results is website performance, i.e. how fast the page loads for the user. Fast sites are preferred and slow ones penalized (to some degree). One common tool to measure page performance is Google’s PageSpeed Insights tool, which among other things reports whether it believes the images on the page are larger than they should be.<br><br><br><br>It then recommends you "optimize the following images to reduce their size", but how? There are many tools available on the web, including those leveraged in this script. After this script is run, PageSpeed will recognize all images as having been optimized. This script assumes you have a Microsoft Azure subscription which has a blob storage account with a container that holds image files as blobs. When it runs, it connects to Azure using credentials you supply (or those already cached from previous connections) and interactively allows you to select your subscription, storage account, and container. It then downloads each image locally, runs the image optimization tool against it, and uploads the resulting optimized file back to Azure, replacing the original contents. Upon uploading the optimized image file, the script also sets a custom metadata flag to indicate that the image has been processed. This is the key "optimized" with value "true".<br><br><br><br>If the script runs again, it will ignore all files it sees have already been optimized, so they are not processed again. This allows the script to be run as many times as needed in an efficient manner, optimizing only new files added since the last run. The compression utilities used are jpegtran and OptiPNG, both freely available for download as an executable file. These must exist in the same directory as the script. These are included in the download package from this page or can be downloaded independently. Ensure the Azure PowerShell module is installed. If not, the script will tell you about that fact in red lettering. It can be downloaded and installed as described here. The script connects to Azure using credentials that have access to the Azure subscription with the images you want to optimize. Therefore, the credentials supplied must be a co-administrator of the subscription. The account can be a Microsoft account, an Office365 organization account, or an Azure Active Directory account. The prompt is a standard web form that will indicate login problems. Be aware that cached credentials will be used if present. The script runs and prompts for credentials if none have been previously cached. It then allows you to select the target storage account and container that has the image files you want to optimize. This version of the script is interactive,  [https://falone.eu/index.php?title=Benutzer:MinervaKelynack Top Source Media SEO] meaning the user is prompted several times. To use this as part of an automated workflow, it could be adapted to remove the prompts and allow specifying the required information via script parameters. 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