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New in version: 9.0   9.1   9.2   9.3   9.4   9.5   10.0   10.1   10.2   10.3    Statistic  

GMImage.GetPixelColor

Get pixel color at location x & y.

Component Version macOS Windows Server FileMaker Cloud FileMaker iOS SDK
GraphicsMagick 2.0 Yes Yes Yes Yes Yes
MBS( "GMImage.GetPixelColor"; ImageRef; x; y )   More

Parameters

Parameter Description Example value
ImageRef The image reference number. 1
x The horizontal position. Range from 0 to GMImage.GetWidth-1. 0
y The vertical position. Range from 0 to GMImage.GetHeight-1. 0

Result

Returns a color value as string.

Description

Get pixel color at location x & y.
Returned color is 16bit in v9.0 or later.
You may need to divide values by 257 if you need 8 bit values.

Examples

Open picture and read first pixel:

Let ( [

$Image = MBS("GMImage.NewFromContainer"; GraphicsMagick::image);
$colorValue = MBS("GMImage.GetPixelColor"; $Image; 0; 0);
$Error = MBS("GMImage.Release";$Image)
];

$colorValue )

Trims space around image and make transparent:

Set Variable [$BigImageRef; Value:MBS("GMImage.NewFromContainer"; Test::BigImage)]
Set Variable [$Result; Value:MBS( "GMImage.SetBackgroundColor"; $BigImageRef; "RGB 1 0 0" )]
Set Variable [$Result; Value:MBS("GMImage.Trim"; $BigImageRef)]
Set Variable [$Result; Value:MBS( "GMImage.SetColorFuzz"; $BigImageRef; 5 )]
Set Variable [$Result; Value:MBS( "GMImage.SetMatte"; $BigImageRef; 1 )]
Set Variable [$farbe; Value:MBS( "GMImage.GetPixelColor"; $BigImageRef; 0; 0 )]
Set Variable [$Result; Value:MBS( "GMImage.ReplaceColor"; $BigImageRef; $farbe; "RGB 1 1 1 1"; 5)]
Set Field [Test::Result; MBS( "GMImage.WriteToPNGContainer"; $BigImageRef )]
Set Variable [$Error; Value:MBS("GMImage.Release";$BigImageRef)]

See also

Example Databases

Blog Entries

Created 18th August 2014, last changed 9th January 2020


GMImage.GetPage   -   GMImage.GetProfile

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