Shotwell
Shotwell supports JPEG, PNG, TIFF, BMP, GIF, WebP and RAW photo files. Shotwell's RAW format support is currently limited. When you view a RAW photo, you are actually viewing a JPEG derived from the RAW photo, not the RAW image itself. Additionally, the RAW editing pipeline is not fully 16-bit - you can only export edited photos as 8-bit files. Most supported formats can be used for export (JPEG, PNG, TIFF, BMP). The Basic Information pane appears at the bottom of the sidebar, and displays a brief summary of the photos you've selected. If no photos are selected, it displays a summary of the entire collection. You can toggle the display of this pane using the information command. The map pane appears at the bottom of the sidebar as part of the basic Information pane, and displays an overview map the photos you've selected. If no photos are selected, it displays an overview of the entire collection.
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Image Viewer Ultimate
Image Viewer Ultimate is a great application to view/run slideshows of your images/photos and it is also having batch resize and batch watermark features. Fit to actual size, zoom in, zoom out, full-screen mode, and play images as a slide show on Windows. Set slideshow time, setting available through application preferences. Supports retina display. Can export images as JPEG, PNG, TIFF, JIF, BMP. Batch conversion to the desired format as JPEG, PNG, TIFF, JIF, or BMP. Batch watermark to desired images. Save images in the desired size.
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ImageGlass
ImageGlass is another open source basic image viewer, which, while simple, benefits from the speed that comes with being so lightweight, and is a good choice for Windows users. ImageGlass has several built-in shortcut keys that can save you time in your daily workflows. This guide provides a quick reference to each shortcut available in ImageGlass. ImageGlass supports the most common image formats, including GIF, PNG, WEBP, SVG, RAW,... You also can customize this extension list easily. Learn how to manage ImageGlass using built-in command lines like a pro. These can be useful to system administrators, and to other programs calling the application. Learn how to control ImageGlass over configuration, pre-define or even lock some settings at installation.
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Pixea
Pixea is an image viewer for macOS with a nice minimal modern user interface. Pixea works great with JPEG, HEIC, PSD, RAW, WEBP, PNG, GIF, and many other formats. Provides basic image processing, including flip and rotate, showing a color histogram, EXIF, and other information. Supports keyboard shortcuts and trackpad gestures. Shows images inside archives, without extracting them. Supports JPEG, HEIC, GIF, PNG, TIFF, Photoshop (PSD), BMP, fax images, macOS and Windows icons, radiance images, and Google's WebP. RAW formats Leica DNG and RAW, Sony ARW, Olympus ORF, Minolta MRW, Nikon NEF, Fuji RAF, Canon CR2 and CRW, Hasselblad 3FR. Sketch files (preview only) and ZIP archives. Export JPEG, JPEG-2000, PNG, TIFF, and BMP. Pixea supports animated GIF, PNG, and WebP images.
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