When an image needs to be adjusted for brightness or color the usual procedure is to open it in an image manipulation package such as Photoshop, make the adjustments and save it to a new file. This procedure is tried and true but it is unnecessarily cumbersome. What are shown above and below are applications of Java applets which allow adjustment of the way an image is viewed through simple modification of <param> tags. These applets allow quicker viewing of how the adjustments appear than the open-modify-save-upload sequence.
Suppose someone wants the farm scene below to appear a bit greener than it is in reality.
The applet allows an increment in the green component of the color at each pixel. Below is shown the result of adding 40 to the green component at each pixel.
An alternate means would be to scale up the green component of the pixels by some factor, say 1.5. The result is shown below:
The second method is better for maintaining contrasts.
Suppose a realistic image of blue roses is desired. One way to get blue roses is to switch the blue and red component in the image. What results has the subtle variations in color of a real rose but with predominant blue color rather than red. The original and the result are shown below.
If one wants an image of a yellow rose one can take a picture of a yellow rose and scan it and upload it. Or, one can use the applet and make the green component equal to the red component with the result shown below:
Another entirely different applet allows for the conversion of a specific color into another specified color as shown previously and is shown below: