Viewing Images

As well as the integrated Viewer Pane, Opus includes a standalone (floating) image viewer. This can be used to view images, movies, documents and other formats for which a plugin exists.

You can access the standalone viewer in several ways:

• If the Use internal picture viewer option is turned on on the File Operations / Double-click on Files page in Preferences, double-clicking on a recognized image file will open it in the standalone viewer.
  
• The Slideshow button on the default toolbar will launch a slideshow of all images in the current folder, using the standalone viewer.
      
  The speed of the slideshow is controlled from the Viewer / Slideshow page in Preferences.
  
• The internal Show command will display selected files in the standalone viewer. You can add this to your toolbar or menu using the Customize dialog.
• From outside of Opus, you can use the d8viewer.exe or DOpusRT.exe /show commands to open files with the Opus viewer.

There are a number of options that control the appearance and behaviour of the standalone viewer. These can be found on the Viewer / Standalone Viewer page in Preferences. By default, the viewer will:

• Auto-size to fit every picture - as you step through images, the window will resize if needed to display the picture.
• Open centered on the current monitor.
• Display a frame around the picture (as in the above screenshot).
• Show or hide the scrollbars while viewing images.
• Automatically build a list of all other pictures in the folder, when opened via a double-click on an image file (with an additional option for the list to wrap-around when you reach the start or end).
• Automatically rotate images to compensate for the EXIF orientation tag, saved by most digital cameras.

These options can all be changed from Preferences.

By default, the main mouse and keyboard controls for the standalone viewer are as follows:

• Scroll the image: Drag the image around with the left mouse button, or use the cursor keys.
• Drag the image to another application: Using the left mouse button, click and drag the window icon (top-left of the titlebar) and drop it on another program which accepts image drops (e.g. most image editors).
• Select part of the image: Using the left mouse button, hold shift and then click and drag over the image to create a selection rectangle. You can then use Ctrl-C to copy that part of the image to the clipboard or Ctrl-R to crop what the viewer displays. (Note: If you use Ctrl-C without a selection then it will copy the entire image to the clipboard, so you don't have to Select All first.)
• Toggle slideshow mode: Hold shift and double-click the left mouse button. You can also push either S or P. The current list of images will be cycled through on a timer.
• Toggle full-screen mode: Click the middle mouse button or push Return on the main keyboard or Enter on the numeric keypad.
• Next or previous image: Turn the mouse wheel or push the Space and Backspace keys.
• Delete the current file: Push the Delete key.
• Zoom in and out: Push = and - on the main keyboard, or + and - on the numeric keypad. You can also hold Ctrl and turn the mouse wheel.
• Reset to original size (100% zoom): Push O (letter-O) on the main keyboard, or / on the numeric keypad.
• Set to specific size (25% to 800% zoom): Push Ctrl-1 through to Ctrl-8, on the main keyboard, for various zoom presets.
• Fit to page: Push F. Large images are reduced if too large for the window, but images are never enlarged. (Aspect ratio is always preserved.)
• Grow to page: Push G on the main keyboard, or * on the numeric keypad. Large images are reduced to fit in the window; small images are enlarged to fill the whole window. (Aspect ratio is always preserved.)
• Rotate the image to the left: Push 1 on the main keyboard or numeric keypad.
• Rotate the image to the right: Push 3 on the main keyboard or numeric keypad.
• Flip the image (180 degree rotation): Push 2 on the main keyboard or numeric keypad.
• Reset the image's rotation: Push 0 (zero) on the main keyboard or numeric keypad.

Behaviour of the mouse wheel and mouse buttons can be changed via Preferences. For example, you can make the left mouse button advance to the next image or close the viewer if you prefer.

There are several other actions and hotkeys which you can find via the menu at the top of the viewer:

• File: The File menu contains commands to open a new image, save the current image (useful when you have cropped it, or want to convert it to a different format). You can print the current image, and launch the Image Conversion function to convert, resize or rotate the image.
• Edit: Contains some simple file-manipulation commands (Copy, Move, Cut, Delete). You can also copy the image (or a selected portion of the image) to the clipboard for pasting into other applications. It is also possible to crop the image to the current selection. The Tag File command is useful when you want to vet a collection of images - you can step through them one at a time in the viewer, and use the Tag File command (or press Ctrl+T) to tag the images you want to keep. This has the effect of putting the parent Lister into Checkbox mode; images you tag will be automatically checked for later processing.
• View: Contains commands that let you modify the appearance of the viewer window. You can also rotate and zoom in and out of the image, apply gamma correction and selectively disable the alpha channel (if any). There is also a Full Screen command to display the image in full screen mode, and the Show Information command displays information about the image file in an overlaid tooltip.

The control bar at the bottom of the viewer is the same as the one in the Viewer Pane - it contains buttons for commonly used functions.

    

From left to right, the buttons are Previous File (), Next File (), Rotate Left (), Rotate Right (), Zoom In (), Zoom Out (), Original Size (), Fit To Page (), Grow To Page (), Hex View (), Slideshow (), Full Screen (), Print () and Settings ().