Detecting bad photos in camera and after
As I've noted, with digital cameras we all take tons of photos, and the next task is to isolate out the winners. I've outlined better workflow for this and there are still more improvements we need in photo management software, but one task both cameras and photo management software could make easier is eliminating the plain bad shots.
I've always wanted the camera to have a display mode that immediately shows, at 1:1, the most contrasty (sharpest) section of a photo I have taken. If I look at that, and see it's blurry then I know the whole photo is blurry, whether it be from camera shake or bad focus. If it's sharp but not the thing I wanted to emphasize, I may realize the autofocus found the wrong thing. (My newest camera shows in the review pane what autofocus points it used, which is handy.)
Indeed, if a camera finds that there is no section of the photo which is sharp, it might even display or sound a warning. Yes, sometimes I will take shots of fuzzy clouds where this will be normal. I can handle the false warning then. It might be so dark I can't get a good shot and will also ignore the warning, but other times it might tell me to shoot that one again.
(Nikon cameras have a feature where they take 3 shots and keep the sharpest of them. That's handy, but I still want to know if the sharpest of them is still no good.)
The camera could go further. With more sensitive accelerometers, it could actually calculate how much the camera rotated while the shutter was open, and since it also knows the focal length, it could calculate the amount of motion blur there will be in the shot. Again, it could warn you when it's too much, and tag this acceleration data in the EXIF fields of the file. Yes, sometimes one takes a tracking shot where you pan on a moving object and deliberately blur the background. In theory the detection of sharp objects in the field would reveal this, but in any event you can also just ignore the warning here.
For those will full flash cards, such detection could help in removing turkeys when you have to delete.
Until our cameras can do this, our photo management software could help. As noted, the first task in photo management is to divide the photos into groups. I divide into 5 groups myself -- bad shots, boring shots, average shots, winners and super-winners. Winners go into the slideshow for the particular shooting trip, super winners will go into a "best of the year" category.
The photo management software could scan over the photos, and find ones that are blurry. It could then let me do a quick scan over them, either as large thumbnails, or perhaps again showing me at 1:1 zoom the highest contrast crop. I could quickly pull out any pictures I still want and relegate the others to the bad photo pile, or even delete them. The same could apply for images that are obviously overexposed and underexposed. Again, I will still scan to see if there is anything to save, and in the case of the underexposed, I can do the scan in a mode where a compensation is done to brighten them to see what can be recovered. But after that, I don't want them in the way of my real workflow, to find the winners.