ApolloOne
ApolloOne is a powerful image viewer and manager designed for seasoned amateurs and professional photographers. The design objectives are ease of use and speed and lots of it. Arguably the fastest image viewer ever created for the macOS, it works with your existing folder structure without ever needing to import files into a database. It offers a comprehensive set of tools for photographers, smart memory card imports, displaying camera AF points, rating and culling images, managing metadata, searching and filtering, batch renaming, and much more. Easy to use interface with unique HUD display, maximizes image display area, especially on a Macbook. Browsing history for quickly switching between multiple events or projects. Rotate, mirror, and flip photos and videos instantly. Correct orientation of JPEGs without altering image data. EXIF metadata inspector with search and edit features. Add tags to your favorite list for quick filtering.
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PhotoViewerPro
True full-screen viewer with photo zoom support. Customizable image magnifier. Powerful image editing tools. Resize/resample, rotate/flip, crop, sharpen/blur, adjust lighting/colors/curves/levels, etc. Eleven re-sampling algorithms to choose from when resizing images. Image color effects, grayscale, sepia, negative, red/green/blue adjustment Image special effects. Annotation, drop shadow, framing, bump map, sketch, oil painting, lens. Draw texts, lines, highlights, rectangles, ovals, and callout objects on images. Clone stamp and healing brush. Superior red-eye effect removal/reduction with a completely natural-looking end result. Multi-level undo/redo capability. One-touch best fit/actual size image display support. Image management, including tagging capability, with drag-and-drop and copy-to/move-to folder support. Histogram display with a color counter feature. Compare images side-by-side (up to 4 at a time) to easily cull those forgettable shots. Image EXIF metadata support.
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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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Ephoto
Ephoto is an image viewer and editor written using the Enlightenment Foundation Libraries (EFL). It focuses on simplicity and ease of use, while taking advantage of the speed and small footprint provided by EFL. Enlightenment was launched in the 1990s by Carsten "Rasterman" Haitzler as an easy to use Window Manager (WM) for X11. Since then it has expanded to include the one million lines of C code that form the Enlightenment Foundation Libraries (EFL) and a diverse set of applications. There's a vibrant and active community of developers and users who work on and use the code every day. Editing your images with features, such as cropping, auto enhance, blurring, sharpening, brightness/contrast/gamma adjustments, hue/saturation/value adjustments, and color level adjustment. Applying artistic filters to your images, such as black and white and old photo. Browsing the filesystem and displaying images in an easy to use grid view.
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