RAW files cannot be displayed -- they are sensor data. The format is not a displayable image. In order to create a displayable image, the RAW file must be converted to an image-format file. The software that does this is called a RAW Converter. Cameras that allow the user to record sensor data (RAW files) have RAW converters built in. Programs that display images created from RAW files either are, or have built into them, or have access to, a RAW Converter.
When Aperture first displays an image of a RAW file just imported, it might use the JPG file that many cameras provide alongside the RAW file. (This use is set at "Aperture➞Preferences➞Import➞Post Import Processing".) This short display of a JGP image, immediately followed by the display of an image created by converting the RAW data, confuses many users. Typically, the JPG image has been modified by in-camera post-processing settings that the user wants. The user is happy to see these, and then dumbfounded when the converted RAW image replaces the modified-in-camera JGP. RAW, by definition, is not viewable, and does not contain any post-processing (the "post" in "post-processing" is short for "post-exposure") -- it is just sensor data.
Aperture contains an Adjustment Brick that allows the user to "tweak" the RAW conversion settings: the RAW Fine Tuning Brick. These adjustments are applied on top of the default RAW conversion. Almost no users should have reason for making changes with the RAW Fine Tuning Brick, or for saving these changes as a new default.
Aperture allows you to toggle the Viewer between the image converted at the default RAW settings by the RAW converter (assuming RAW files), and the Image with your adjustments applied. (The command is "View➞Show Original Image"; the keyboard shortcut is "m".) If you use different default RAW conversion settings, that is what Aperture will show you with the "Show Original" toggle.
The Aperture user who imports RAW files should know that there is:
- a RAW file -- sensor data recorded by your camera
- a JPG file alongside the RAW -- of the converted and (if applied) PP'd sensor data recorded by your camera
- an image of the converted-by-Aperture RAW file (format is not specified, JPG is assumed) -- these are created on-the-fly, as needed
- a JPG Preview of image of the converted-by-Aperture RAW file -- this is used while the on-the-fly conversion is being done, when in Quick Preview mode, or when the RAW Originals are off-line. The user sets Preview settings at "Aperture➞Preferences➞Preview".
The imported RAW file is never altered. The JPG file alongside the RAW file is shown once, briefly, and never again in Aperture. Preview existence and use isdetermined by user.
"View➞Show Original Image" ("m" on my machine) toggles the Viewer between showing the fully-adjusted image and the originally-imported file (converted from RAW when needed).
"View➞Quick Preview" ("q" on my machine) toggles the Browser or Viewer between showing the fully-adjusted Image full-size and full-quality, and showing the fully-adjusted Image's Preview.
Does that help?
Message was edited by: Kirby Krieger -- minor changes.