Curves, Curves, Everywhere Curves
Around every curve in the road you are liable to come across another imaging application that contains some implementation of our current topic at hand.
Curves
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Curves
The first post-processing lesson was about manipulating tonal range and balance through the levels control. With Levels, you can change the black point, white point, and midpoint (aka gamma).
Curves are a Filter
Think of a curve as a filter that modifies an image by changing the pixel values that make up an image.
Curves Adjustment
When you need to adjust the contrast in your first choice for the job is should be levels.
The Curves Dialog Box
Figure 3: Curves Dialog Box
Figure 3 shows the Curves dialog box. At the top of the dialog box is the Channel pop-up.
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In addition to a Sigma 15mm f/2.8 fisheye, Chin Boon used a Nikon D700 for this Singapore street scene, exposing for 1/200 sec at f/7.1, ISO 200.
Digital Learning Curves Revisited
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As technology changes, we have to change.
Trigradient Control Curves As stated previously, the trigradient tone reproduction method is based on three tone-control curves (or printer curves): high contrast, medium contrast, and low contrast.
Curves
Allows you to control your color changes precisely and from the entire tonal spectrum. The Curves tool also allows you to preview changes as you make them, as well as view the changes to the ink values in the Info palette at the same time.
curves
A powerful tonal adjustment function found in some scanner drivers and image optimisation programs.
cutaway ...
Curves
Apply in adjustment layers. Use masks if needed.
Gamma/Contrast ...
S-Curves or Shapes: I use shapes as a more relaxed casual way to lead your eye through the composition. A road, a stream, or even the shape of the ground or grasses in front of you can do this very well.
tone curves
a representation of the tonal range of an image showing the progress from black to white. Some image editors allow these to be adjusted for fine tuning of the image.
Using Curves to Correct Color
Pick a point right in the center of the curve line and pull it down a bit to darken the image.
Tone curves
A term for an adjustment available on certain scanners. Beginning as a 45° angle line running up to the right, this line is adjusted into a curve shape by the user to effect colour or tone correction.
Colour curves
A mechanism for controlling colour changes, and matching colours. Colour curves are set by user-adjustable lookup tables that define a colour transform, which may be applied to each primary additive colour in the image.
Curves For Power And Precision. Once a digital file has been acquired, the astonishing tonal control of the digital darkroom can be accessed.
Curves & Levels (including black, gray and white point sample)
Unsharp mask (multiple masks can be overlaid; intensity / width / threshold)
D-Lighting (HS / HQ, adjustment, color boost)
Color Booster (people / nature, level, auto) ...
Curves and Levels are the perhaps the most basic Photoshop adjustments because they address image fundamentals: brightness, contrast, and color.
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Curves
2. Click ‘OK'
3. Select the Blue channel in the Curves window ...
curves
(lower right hand corner, far right eye dropper)Set White point and you are now a pro because no matter what light your using it will come out crisp and very real white with the other colors balanced to that white point.
CURVES: The same basic adjustments as found in the levels/histogram tool. A curves tool starts with a straight diagonal line graph representing the tonal range values from 0 through 255 (black through pure white).
The curves of the circle give it motion. Your eye probably follows it around clockwise and leaves the circle to move back over the content.
The Gentleman's Deck ...
Bézier curves are used in GIMP as component parts of Paths.
The image above shows a Bézier curve. Points P0 and P3 are points on the Path, which are created by clicking with the mouse.
Custom Curves, Scripts & Actions
For uploading and discussion of Custom Curves (.ntc Capture Camera Control files), Photoshop actions, and scripts for programs including Paint Shop Pro and iMatch.
* These curves are reasonable approximations, constructed while ignoring any "post- exposure light latensification"99 caused by the second exposure.
Lines and curves present in your photo, whether in the subject itself or in the area leading to the subject, lend a pleasing aesthetic quality to the scene.
the 20 lp/mm curves (violett):
>45% for the corner
>80% for the center.
the 10 lp/mm curves (green) should be very close to the 5 lp/mm curve (blue).
the 5 lp/mm curves (blue) should stay >95% for the whole X-axis.
All swooping curves and rippling forms, this architecturally innovative museum was built on the site of the city’s former shipyards and inspired by the shape of a ship’s hull.
CS3's powerful Curves controls enables you to fine-tune a RAW shot's colours and tones for an instant boost
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Correct wonky horizons in Photoshop ...
Matching exposure curves of differently exposed images with compensation for non uniform lighting changes
Image fusion ...
Raindrops, Lines, Curves, Form
Photo Credit: Stephen J. Kristof
Abstract - Reflection, Water Droplets
Photo Credit: Kevan Donais ...
Curves: Curves is used to adjust brightness and contrast of each tone separately.
A curves adjustment layer lets me darken the original image, dropping the overall RGB values just below the midpoint. I don’t tend to use more than one point on this layer.
full set of professional color management functions: color balance, levels and curves adjusting, brightness/contrast management, hue/saturation function, color fill, etc.
color channels mode makes work with color adjusting professional and flexible ...
Concave Glass - Concave surface glass is glass that curves inward, as though you are looking into a bowl. If faced with this type of surface you'll actually want to be in the center of the curve and facing directly at the glass to avoid reflection.
Commonly found along country roads, on footpaths through a forest, and along a meandering river, look for S curves that start along the bottom of the frame and lead the eye through the scene.
We all remember our geometry classes, dominated by circles, triangles, and snake-like curves. Applying these simple shapes to your subject matter can help to simplify complex scenes and add visual interest.
Photo Mechanic can do in terms of culling, renaming and adding IPTC applications in its "Library" module, and it also has a "Develop" module with a quick and intuitive nondestructive interface that allows you to apply many of the same levels, curves, ...
As you can see, the super-compact Casio's image is quite a bit grainier, to the point where you can't see much of the details of my face (such as, say, the bumps and curves of my ears, or the whites of my eyes, ...
PRACTICE VIEWING YOUR COMPOSITION - When shooting curves in buildings, waterfalls, Monuments, etc. it is critical to learn how-to shoot from a specific directional angle.
If both mosaics cover an area of the same size, the one created using small tiles has more tiles so it has sharper curves and more detail.
If there are the same number of large and small tiles, the area covered by the small tiles is smaller.
In Photoshop, opening an Adjustment Layer in Curves is the classic approach but you can also reduce contrast in the RAW converter by adjusting the Exposure, Shadows, Brightness, and Contrast sliders.
What is done is to open up the "Curves" feature under "Color" in PSP7 where the default curve is seen to be a straight line at 45 degrees from the point (0,0) on through the mid grey level point of (128,128) and then on to the maximum level of (255, ...
Image Trends has introduced the Fisheye-Hemi plug-in to correct the full-frame fish-eye lens curves in a different way. Basically, most standard software corrections use what are called rectilinear mapping techniques.
S-curves will increase contrast (in this case color contrast = saturation). We are not going to touch the Lightness Channel (L) and therefore we are not changing the brightness or sharpness of the picture.
Unfortunately, OptiCAL's curves window isn't very accurate. You can only drag points, and you cannot enter specific numbers into the Input and Output fields. There is also no way to simply review the points to see what their values are.
Applying tonal or color adjustment such as levels or curves directly on a raster layer mathematically redefines the pixel data the moment you hit save.
They are created from ``Bezier" curves and are ideally suited in describing the hard edge outlines of mechanical or man-made objects.
There are basically eight kinds of lines: horizontal, vertical, diagonal, C-curves, S-curves, arches, circles, and spirals. Each one of these types of lines can produce outstanding images, but my personal favorites are S-curves and spirals.
Arcus is a geometrically constructed font with rounded curves. The font contains a wide range of alternative signs, small capitals, lining and old-style numerals, fractions, superiors, inferiors, ligatures and discretionary ligatures; ...
Glamour photography relies on the power of suggestion, alluding to curves and erogenous zones without actually showing graphic details. Consequently, glamour photos carry a tone of mystery and romance, as much as physical allure.
With seashore landscapes, use C curves. Seashores often have a C curve, so feature them in your photos. Look for C curves in the bodies of humans and animals in reclining positions, too.
Pixel-shaped curves on the diagonal edges of objects. This can sometimes occur since all graphics consist of individual pixels.
The process by which smooth curves and lines that run diagonally across the screen of a low-resolution digital file take on a 'jagged' look as opposed to a smooth, natural rendition.
5.Now, it's time to add the curves layer. Simply create a slanted S in the graph.
6.Now, add a new layer on the top most part and choose the color black. Fill the layer with black color using the paint bucket tool.
Now you have a beautiful, if dark, soft-focus image. So it's time to lighten it up. First, make a Curves Adjustment Layer. You can do so quickly by clicking the black-and-white circle at the bottom of the Layers palette, and choosing Curves.
Jaggies: The stair-stepping effect that can be seen in curves and diagonal lines when a picture's resolution is too low and individual pixels begin to show in the image.
JPEG: Joint Photographic Experts Group (see "Compression").
Steep death curves - they'll work fine and then suddenly run out of power unexpectedly. Most importantly, only the latest Canon Speedlites can use them.
 See also: Image, Photograph, Light, Digital, Photoshop
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