You can select a particular color only from the used colors and change that color to the specified hue. For the setting method, refer to the following.
21.7.3 Color Animation (Hue Animation) Settings
From the [Draw (D)] menu, select [Image Placement (I)] or click 
.
Click the screen drawing area to place the image part. Double-click the object to open its dialog box and define the [Files of type] and [File name] of the image to paste.
Adjust the image quality and number of colors, and click [Open].
Select [Transparent] check box to enable the [Settings] button. Click the button, and in the [Transparent Color Settings] dialog box, use a dropper to select the color on the image to make transparent. This feature is useful for making the background color transparent on pasted images.
The following [Image Registration] dialog box will appear. Set the size and blink rate for the image to paste.
When [Original Size] is selected, an image is placed with the same size as the original image. You cannot change the image size after placing it.
When [Fix Aspect Ratio] is selected, an image is placed with the original image horizontal to vertical ratio fixed.
Click [OK] and the designated image will be placed.
You can also paste bitmaps without using [Image Registration]. From the GP-Pro EX [Edit] menu, click [Paste] to paste captured bitmaps directly to the drawing screen.