gThumb may look like yet another image viewer, but behind its unassuming appearance hides a rather capable application that can help you to manage photos efficiently.
As any decent image viewer, gThumb provides all essential tools for browsing images and performing basic operations, such as rotating and resizing graphics files, converting images to different formats, and tweaking EXIF metadata. If you use tags to keep tabs on your photos, you’ll appreciate gThumb’s tag editing feature. To quickly assign one of the existing tags to a specific photo, right-click on it and choose the desired tag from the Tags menu. Choose the Other item to add new tags and assign them to the photo. To specify additional metadata, press the Comment button on the main toolbar, and fill out the available fields.
gThumb allows you to group photos into so-called catalogs (you can think of them as virtual folders), and the Organize button lets you generate catalogs based on several criteria, such as dates and tags. You can also create custom catalogs and add photos to them manually. To create a new catalog, right-click on the Catalogs item in the navigation pane, choose the Create Catalog command, give the catalog a descriptive name and press Create. Add then photos to the catalog by right-clicking on them and choosing the catalog from the Add to Catalog menu.
The application also features a handful of basic editing tools. To access them, double-click on a photo, and press the Edit file button in the top-right corner of the editing interface. While gThumb won’t replace a dedicated image editing application, the available tools can come in handy for quickly tweaking basic settings like brightness, saturation, and contrast as well as adjusting white balance and fixing common problems.
The Share button on the main toolbar lets you upload photos to several popular photo sharing services, including Flickr, Picasaweb, and Photobucket.
These are just a few highlights, and gThumb offers a slew of other useful features which make it a competent tool for managing and tweaking photos (take a look at a list of gThumb’s features to get a better idea of its capabilities). So if you are looking for a fast, lean, and feature-rich image viewer, gThumb fits the bill rather nicely.