Paint Shop Levels
With most images the adjustment will also improve the contrast and it may be one of the first adjustments you want to do on an image.
The intent of the adjustment is to expand the tonal range of an image so that it covers the full lightness range from 0 on the left (the shadow area) all the way up to 255 on the right (the highlight area).
By the end of this tutorial you will have a good understanding of the Levels adjustment and an appreciation of just how useful it is to understand the Histogram.
The tonal range is seen in the image's Histogram (which is really useful to understand) and here is one that covers the full range ...
Ideally the best image will have pixels at each level from 0 to 255 in a shape somewhat similar to this one. The perfect histogram will be a nice bell curve shape but this one is pretty good.
In this tutorial I will be using this image of Libby (one of my two Miniature Bull Terriers) with her favorite ball during a bit of down time.
I like the picture but it is a bit dark. This is confirmed in the histogram. Most of the pixels in the image are grouped from the high shadows to the low mid tones, hence the dark image.
The right end of the histogram is the highlight area and remember that ideally the full tonal range will extend right up to 255. In this image the first pixel in the highlight area is at position 211 so 44 levels of lightness are missing and that amount of missing information will have an effect on the image.
If you feel so inclined you can find this out for yourself with your image. Move your cursor over one end of the horizontal line, left click and hold and then drag the cursor along the line.
The information on the right side of the histogram will change according to the cursor position.
Back to the image - if I want my shot of Libby to cover the full tonal range then some adjustment is required. That adjustment is the Paint Shop Levels adjustment.
You have two choices to do a levels adjustment - directly on the image or with a levels adjustment layer.
Use the adjustment layer - here it is ...
You can click on one of the buttons on the right side of the dialogue to make adjustments ...
You can also select one of the color droppers and click on the image letting Paint Shop Pro make the decisions for you but that is somewhat hit and miss unless you press the ALT key and work in the Before pane (the one on the left) of the Preview window.
What this does is automatically determine the white, black or gray point. As you move the cursor around in the Before pane with the Alt key pressed through the light, dark and mid-tone areas, the appropriate color dropper is activated and you simply click to set the point.
In this screen shot the cursor is hovering over an orange area which is a mid-tone.
There are three little diamonds below the levels histogram and this is what they do ...
With the Libby image there is some highlight information missing (remember - the first pixel in the highlight area is at position 211 so 44 are missing).
The way to correct this is to put your cursor over the highlight diamond (the one on the right), left click and drag it to where the histogram starts to rise. It doesn't have to be at 211 - make sure that Preview is checked and watch the image.
If you wish to be exact then either watch the little box on the right below the highlight diamond or just double click in the little box and enter the number.
I just moved the diamond to 211 and this is how it looks ...
And this is how the image of Libby looks now ...
Now that is much better and Paint Shop levels is such an easy adjustment to make - here is the new histogram (the new adjustment layer has to be merged with the background to see the resulting histogram) ...
As you can see the highlight area has been moved up to the right side at position 255.
The major part of the histogram is still in the high shadow/low mid tone area but that's OK. It's part of the charm of this image.
If I wanted to lighten the ground around my little girl then I could move the mid-tone slider to the left after making the highlight adjustment but - nah. I like it the way it is.
I bet you want to see it anyway.
The background is now rather bland and that is apparent in the histogram because the curve does not extend all the way to the shadow end anymore. Every image is different and the second adjustment to the Paint Shop Levels may cause your image to pop beautifully.
The first adjustment (highlights only) is the only one that was needed with this picture.
Dog Walking Park
Sometimes it's embarassing to show one of my really crummy images. This is one of them ...
And here is the histogram ...
After our journey thorugh Paint Shop Levels do you have any idea what's wrong with this image (other than you really can't see what it is)?
In my defence it was getting dark and it was raining.
Anyway - there is a very tall spike at the left side of the histogram which says the blacks (aka shadows) are clipped and there are virtually no highlights other than the headlights and reflections on the wet pavement.
There are a few different ways to work with a difficult image like this ...
You won't learn anything if you delete it so that is not a very good option and maybe there is a photographic gem hiding under all that darkness!
Blend Modes are great and will handle this quite nicely. Youll find Blend Modes here.
This is a Paint Shop Levels tutorials so let's work with them.
The procedure is simple - create a new Levels Adjustment Layer and drag the Highight slider to the left until you come to the place where the histogram starts to rise. With this image it is at that first little bump around position 73 and the mid-point slider was moved even further down to 17.
Remember the lightness range spans 256 levels (0 to 255) and this image only covers about 73 of them!
Here is the image after the adjustment ...
Now that made a huge difference, didn't it?
The new histogram of the merged layers shows that the lighness levels extend all the way from 0 on the left to 255 on the right.
There are, however, some gaping holes in the shadow end and there is still some clipping in the shadows.
The mid-tones that didn't exist in the original, are well represented in the adjusted image.
I agree that while the Paint Shop levels did bring out the image it's still not perfect. It's nice to know that you can rescue an important image with Paint Shop levels if your really need to.
When you open any image check out the histogram to see what you have. If there is any information missing create a levels adjustment layer and make your adjustments. When you like the results click OK and merge the layer down.
This will give you a tonal range that spans the full brightness range (the perfect starting point) so now you can move ahead with whatever other adjustments you need to make.
Paint Shop Levels
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