software for digital images enchancing, modification and analysis.
Free download:
LeoPicture.zip
LeoPicture.exe
selfextracting winzip file
Content: Introduction Concept File: open accept accept plus paste plus from selection save save as save all delete delete all print print preview lens set default Common operations: brightness contrast saturation sharpness filters scale document landscape fix red eyes image analysis Colorimeter: Color Color of one pixel Color of object Quality control Selection: auto manual show islands gaps expand shrink invert all all plus borders color Size, zoom and deform: rotate mirror zoom deform Color: select grey color fill add pull out label paste Registration: trial version limitations registration
LeoPicture can be used as colorimeter (chroma meter) for analyzing colors in the
whole image in its selected area(s). As well you will be able to compare
standard color with color of selected area.
A concept of the color is quite difficult by itself even if we are talking about single point (pixel) of the image. A definition of the color of the area that contains number of pixels is considerable more sophisticated as description of one person and population of town. One person has his height, crowd can be characterized by average value of heights, standard deviation and histogram of distribution.
Physically color of one point can be characterized by reading of three cone neighbor cell detectors on retina of eye. Each of these detectors has its own area wavelength sensitivity in spectra. Making very lazy simplification one can named them red, green and blue receptors. Reading these sensors sent to brain where normalized can be presented in form RGB (RedGreenBlue) color space. Historically and for pure convenience of manipulation in computers values these prime colors are in range from 0 to 255 each. Combination of these three numbers gives millions of different colors.
Other natural way to characterize a color is not from point of view of observer but characteristic of photons bean. Here will be simplification too, sorry. One can describe ray of light with wavelength of photons, signal/noise ratio and intensity and . There characteristics can be associated with numbers named Hue, Saturation and Brightness. Hue represent color by name itself and lies in range 0-359. The range rightly hints that it is like red, blue, green projectors illuminate circle screen in tree opposite directions. So 0 and 359 of hue is neighbor colors. Strange. Saturation measure how far the color are from grey, 0 grey, 100 is naive color. Brightness shows a grade between black and white. From 0 for black to 255 for white. In LeoPicture brightness is just average of RGB values. Note that in other approach brightness are defined as maximum of RGB values. We don't think that it is much sense as soon pure pure red, and very pink for example will have the same value of brightness 255. Not too practical from our point of view. When we taken brightness as average pure red had 85 and very pink around 240.
click on picture to enlarge
