How do I Create a Color Picker Swatch?
This lesson will show you how to make a color picker swatch.
Create a Graphic
Select the Graphic tool (1) and draw a square graphic on a stack (2).
Make Graphic Opaque
Open the property inspector for the graphic and set the Opaque property to true.
Edit the Script
Open the script editor for the graphic and enter the script shown below.
The script uses the answer color dialog to display the system color picker (1). The backgroundcolor of the graphic is passed in as the default color to display in the color picker (2). The color the user selects is then assigned to the background color of the graphic (3).
Copy & Paste
on mouseUp pBtnNum if pBtnNum is 1 then ## Prompt user for color using current color as default answer color with the effective backgroundcolor of me ## If user didn't cancel then assign background color ## to chosen color if the result is not "cancel" then put it into theChosenColor set the backgroundcolor of me to theChosenColor end if end if end mouseUp
The Script in Action
Switch to Run mode. Clicking on the graphic will now display the color picker.
Choose a new color and click OK.
The graphic is now assigned the new color.
I've tried this tuts, but it cant run because of theChosenColor
is there any clue?
you did not provide much information in your comment. I can only assume that you have Variable Checking switched on. This is a tick next to "Edit -> Variable Checking". You can either turn this off, or you could declare the variable "theChosenColor" before it is first used. Update the code as follows:
on mouseUp pBtnNum
if pBtnNum is 1 then
could i apply this method to an image which is thresholded ?
i mean, i want to make an application about color design. the steps are opening image > threshold (using slider) > coloring (maybe use this method)
i've done my app just till thresholding. then, i very confuse on coloring step.
could u help me?
you could certainly use a color picker to return a value to which you would want to set regions in an image. Not sure if you can use the exact code from this example, as you are setting the "backgroundcolor". If you threshold an image, you may only be wanting to set certain regions of an image.
Once you have thresholded an image, I would assume that the image contains two colours. You may then want to process the entire image and set one of the colours to a different value than the one you thresholded to. This value could be provided by the colour picker.
Have a look at the following lessons:
This should give you the fundamental building blocks for some image processing. You may find the command "convolve" in the following lesson useful:
It allows you to loop through all pixel in an image and do something to them.