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Creating and blending colors

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List of contents :
Introduction
Java applet for creating color
Java applet for blending two colors
Applet does not run

Introduction

This page provides two simple tools for creating and changing colors that are used on the computer.

The first applet allows the creating of any color by combining red, green, and blue values (0-255). Once the color is created, it is placed on a map, and its saturation altered by the addition of grey (from left to right), and it is tinted (adding white) and shaded (adding black) from top to bottom. This allows the user to choose a color, with its variants of saturation and tone.

The second applet allows the blending of any two preselected colors. The two colours to be blended are entered into the appropriate btext fields. Please note that the color should be in the web page hex notation, so white is #FFFFFF and black is #000000. On clicking the blend button, the colors designated will appear, so that the user can check that the right colors have been entered. The blending map then appears. The varying level of blending is from left to right, and the amount of tinting and shading for each combination is from top to bottom.

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Applet does not run

If the applet does not appear, then the two most likely reasons are

  • If your computer is own by a company or institution, it is possible that there is a policy to block JAVA applets or scripts for security reasons. You should make enquiry whether this is so. If this is so, then there is nothing you can do except to use the applet at home on your own computer.
  • It is possible that the JAVA run time machine (JRM) is not installed on your computer. In some computers, there is an automatic offer to download this when you try to run a JAVA program, but in others the applet just appears blank, and you will need to go to Sun Microsystem's JAVA page, download the installation file (15MB) to your computer, and install the JRM onto your computer, after which the applets should run automatically on your browser.

If the message "time expired" appears when you run the applet, then you need to reload the page and the applet from the server. The applet has a time stamp on it when downloaded, and will only run for 24 hrs. Some computers save the applet and re-run it to save downloading time so may run a time expired applet. Click the refresh button will sometimes fix this problem. If not, then you will have to clear the browser cache, or to exit and then restart the browser.

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