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Photography  Curvature of field  Curvilinear distortion

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.

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Curves to Create A Metallic Look
by nicoledb
This tutorial describes how to create a metallic effect using Curves in Photoshop. I learned the technique from the book Photoshop 7 Down & Dirty Tricks by Scott Kelby.

PDF version

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.

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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.


tips and tricks
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

Page 1 2 Next>>
As technology changes, we have to change.

Trigradient Control As stated previously, the trigradient tone reproduction method is based on three tone-control (or printer ): high contrast, medium contrast, and low contrast.

Lesson 9 - ‘S' Curves
Another dynamic composition tool is to include a "S" curve. As the name suggests, a major element of the composition would be an object such as a stream, path, railing, or other curved object that creates an "S." ...

Allows you to control your color changes precisely and from the entire tonal spectrum. The 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.

This is a little more complex. This is better if you have an image with bright highlights and want to bring up the shadows in exchange for flattening the highlights a little.

: Derived from “Transfer Curve', refers to a graph describing the relationship of the Output (on the vertical, or “Y' axis) and the Input (on the horizontal, or “X' axis). A 1:1 correspondence (ie.

A powerful tonal adjustment function found in some scanner drivers and image optimisation programs.
cutaway ...

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.

Using 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.

For Power And Precision. Once a digital file has been acquired, the astonishing tonal control of the digital darkroom can be accessed.

Curves can usually be applied to all channels together in an image, or to each channel individually.

and Levels are the perhaps the most basic Photoshop adjustments because they address image fundamentals: brightness, contrast, and color.
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TAGS: photoshop, tips, adobe, overdo, addiction ...

A short video showing how to use the curves adjustment to control contrast.
Color ...

, name it "General ", and choose Linear Contrast from the dropdown menu on the Adjustments Panel. It will increase the general contrast a little.
Finally, let's add a black border: Go to Image ...

The curves and spirals are reminiscent of the Guggenheim Museum in New York and the
Greek Orthodox Church in Milwaukee. The waves of arched windows recall the Marin County
building in California.

The 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 ...

Tone curves can be adjusted for each color channel separately. The lens aberration window offers correction of light fall-off, chromatic aberration, distortion and color blur.
Distortion correction in Digital Photo Professional ...

The "" tool is a proprietary tool that can be found in the Adobe photo editing program "Photoshop CS5" and prior versions.

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.

D-Log E
The development times recommended by Jacobson and Jacobson (1972) for the Stoeckler two-bath developer are for an earlier generation of films, and the same development times are repeated by Anchell (1994) and Anchell and Troop (1999).

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.

Levels and can be used in conjunction with black and white conversion to provide further control over tones and contrast.

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.

the 20 lp/mm (violett):
>45% for the corner
>80% for the center.
the 10 lp/mm (green) should be very close to the 5 lp/mm curve (blue).
the 5 lp/mm (blue) should stay >95% for the whole X-axis.

Adjust Color Curves. (It's called Levels with other paint programs and Photoshop CS.) ...

Matching exposure 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 ...

: 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.

Concave Glass - Concave surface glass is glass that 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.

See also: See also: Photograph, Light, Photography, Image, Time

Photography  Curvature of field  Curvilinear distortion

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