WidsMob Viewer
View single image, multiple images or folder-based images in incredible fast speed and simple operation with various viewing modes. You can browse all your photos in one window without extra clicking and operating. Offer stunning filters and effects, adjust photo parameters like exposure, contrast, saturation, temperature, Sharpness, etc. and crop photo to suitable size as your iPhone, Android phone or computer wallpaper. When you have hundreds of photos, you can only add one image or the whole folder to WidsMob Viewer to preview all images. Even if you need to view photos in different folders, you can use the library mode. It has an advanced algorithm to view photos at super fast speed. Besides the JPG, JPEG, TIFF, PNG, BMP and other photos format, WidsMob Viewer also supports most of the popular RAW formats. It is able to load RAW files from SD card or external drive. It also enables you to turn RAW files into JPG, PNG and other photo formats.
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Sequential
Sequential is an image viewer for Mac OS X. It was originally designed for opening a folder of images and displaying them in order. It works well for viewing comics and manga. Sequential can display folders and archives (ZIP, RAR, CBZ, and CBR) of images (including JPEG, PNG, and GIF) and PDF files. It is able to load images on the internet from a page or image URL. Sequential has mature full-screen support and can display images' Exif data. All of Sequential's source is available through Git. Once your code is working and well-tested, you should be able to create patches.
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FastPictureViewer Pro
Designed for photographers, and built for speed, runs perfectly on Windows 10, Windows 8.x, Windows 7, and Windows Vista/XP. Point FastPictureViewer Professional at your image's folder and start reviewing, culling, and rating within seconds, in RAW or JPEG format, be it 10 images or 10,000, no wait. Google the fastest image viewer and see who comes on top, 3 million users and counting cannot be wrong! Full support for 4K & 5K monitors and beyond (perfect scaling, no tiny fonts!), with full-color management. Sort by folder & file name, or by date, forward or reverse (F3 key) Tag your photos (star rating) in one keystroke (1-5), filter by rating (F), and copy/move in batch (Ctrl+F) While you evaluate an image, FastPictureViewer uses the native 64-bit power of your computer to prepare the next picture. When you are ready to move on, FastPictureViewer displays the next image instantly, no wait, not even a fraction of a second.
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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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