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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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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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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Another Photo Viewer
This is a offline image gallery application. You can upload your images into the application, with your own sorting order (alphabetical order), and directories structure. You can transfer your photos via iTunes, or just import the photo from your device. There are some simple functions that help you to manage your photos in the app. On top of those, you can view the images in full-screen mode or slide-show mode.
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