The Download Hi-res Images feature creates a button for each image in the gallery, allowing visitors to download the image to their desktop.
To enable this feature, tick the Enable Image Downloads checkbox and provide a Hi-Res Image Folder Name where the downloadable image renditions are to be stored.
When enabled, icons will appear on the thumbnail grid as pictured below.
The icon colors are user configurable. If using the a Highslide gallery style, then download icons will also appear in the large image view; icons are not available in the large image view using the Photoswipe gallery style.
By default, the Hi-Res Image Folder Name is set to “photos”, which is the location of your standard large rendition images generated by the gallery. These are standard, web-resolution images; the very same that appear in the large image view when clicking on gallery thumbnails.
Should you wish to provide larger, print-resolution images, then you will need to export these images separately using Lightroom's Export module. On export, these images will be saved into a folder. Whatever you name that folder is the name you should enter here as the Hi-res Image Folder Name.
After exporting both your image gallery and your hi-res images, you should move the hi-res image folder INSIDE of the exported gallery folder.
If using TTG Publisher to manage your galleries, then your options here will be a little bit different than described above. More on this below.
If using tooltips, this text will appear when mousing over the Download Image icon.
The gallery supports two methods of accessing your downloadable image files.
The PHP method utilizes a PHP script to force download of the image file when the icon is clicked. This method is usually the preferred choice, but obviously requires a web-server with PHP support. If you are unable to utilize PHP scripts in your environment, or if the script causes other issues for you, then switch to the HTML method.
When using the HTML method, clicking the Download Image icon will cause the downloadable image files to load in the web-browser in a new page/tab. Users may right-click the icon to download the image file directly, without opening a new page/tab. In this case, you may with to change the Title for Download Icon text to read something like, “Right-click to Save Image.”
If uploading JPGs for download, then select “JPG”; if uploading TIFs for download, then select “TIF”. This ensures the Download Image icon hyperlink will correctly reference your image files.
This option has no effect on templates for TTG Publisher.
If using TTG Publisher, you have the option of having the Publish Services plugin generate and upload the files, or uploading the images manually as described above.
Using the publisher is more convenient, but bear in mind that the publisher is only capable of exporting JPG file renditions. If you need to provide downloadable TIF files, then you will need to export and upload those files manually.
Also, if attempting to upload images which are too large, you may hit your server's PHP-upload limit and find that the images files cannot be uploaded. If this occurs, you will need either to adjust your output parameters to produce files of a smaller size (either by reducing image dimensions or image quality), or ask your host to increase the PHP-upload limit for your account.
The other consideration is simply that the Export module allows you greater control over image output than the publisher does, which may be an issue if you're particular about the parameters of your deliverable files.