dModifyHSL (Function)

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dModifyHSL (Function)

In french: dModifieTSL

Modifies the hue, the saturation and the lightness of an image found:

in an Image control,
in a variable of type Image.
This type of variable is not available.

Caution: In Linux, this function requires a specific configuration. For more details, see Drawing in WINDEV, WEBDEV and WINDEV Mobile.

Example

// Change la teinte, la luminosité, la saturation de l'image contenue dans le champ IMG_Image1
dModifyHSL(IMG_Image1, 50, 50, 50)

Syntax

<Result> = dModifyHSL(<Source image> , <Variation of hue> , <Variation of saturation> , <Variation of lightness> [, <Destination image>])

<Result>: Boolean

True if the change has been made,
False otherwise.

<Source image>: Character string or Image variable

Image to use. This image can correspond to:
the name of an Image control.
the name of a variable of type Image.
This type of variable is not available.

<Variation of hue>: Integer

Value included between -360 and +360. This value will be added to the current hue of each pixel to get a new hue.

<Variation of saturation>: Integer

Value between -100 and +100. This value will be added to the current saturation of each pixel to get a new saturation.

<Variation of lightness>: Integer

Value between -100 and +100. This value will be added to the current lightness of each pixel to get a new lightness.

<Destination image>: Optional character string or Image variable

Image where the transformed image will be drawn. This image can correspond to:
the name of an Image control.
the name of a variable of type Image.
This type of variable is not available.
If this parameter is not specified, the transformation will be performed on the <Source image>.

Remarks

Drawing in PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting providers and therefore it is always enabled. The version of the GD library must be version 2.0.28 (or later). This library can be downloaded from the PHP site.

To enable (if necessary) this library locally, the following elements are required:

PHP installed.
the PHP.INI file found in the Windows directory must contain the following line: "extension=php_gd2.dll" (instead of ";extension=php_gd2.dll").
the php_gd2.dll file must exist in the directory of PHP extensions. This directory is defined in the PHP.INI file by the "extension_dir" variable.

Drawing in Browser code

Some drawing functions are available in Browser code. The drawing functions in Browser code are based on the HTML 5 standard. More specifically, these functions are based on the "canvas" tag of HTML 5.

The drawing features in browser code are available for the recent browsers only (supporting the HTML 5 standard). To find out whether the drawing features are proposed by your browser, use DrawingAvailable.

Please note To use the drawing functions with Internet Explorer 9, the project must include a reference to the DTD file. To do so, the HTML mode must be "HTML 4.01 Transitional + DTD". This option is available in the "Advanced" tab of the project description window.
Reminder: To display the project description window, under the "Project" pane, in the "Project" group, click on "Description".

Special case: Drawing in the browser of an Android phone Browser drawing functions are only available in Android version 3 and higher.

Related Examples:

Unit examples (WINDEV): Modifying the Hue, Saturation and Lightness

[ + ] Process on the images via the WLanguage dModifyHSL function.
This function is used to modify the hue, the saturation and the lightness of an image.

Component: wd300pnt.dll