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The EXT_sRGB extension is part of the WebGL API and adds sRGB support to textures and framebuffer objects.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Availability: This extension is only available to WebGL1 contexts. In WebGL2, the functionality of this extension is available on the WebGL2 context by default. The constants in WebGL2 are: gl.SRGB, gl.SRGB8, gl.SRGB8_ALPHA8 and gl.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING.

Constants

This extension exposes the following constants, which can be used in the texImage2D(), texSubImage2D(), renderbufferStorage() and getFramebufferAttachmentParameter() methods.

ext.SRGB_EXT
Unsized sRGB format that leaves the precision up to the driver.
ext.SRGB_ALPHA_EXT
Unsized sRGB format with unsized alpha component.
ext.SRGB8_ALPHA8_EXT
Sized (8-bit) sRGB and alpha formats.
ext.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT
Returns the framebuffer color encoding (gl.LINEAR or ext.SRGB_EXT).

Examples

var ext = gl.getExtension('EXT_sRGB');

var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);

gl.texImage2D(gl.TEXTURE_2D, 0, ext.SRGB_EXT, 512, 512, 0, 
              ext.SRGB_EXT, gl.UNSIGNED_BYTE, image);  

Specifications

Specification Status Comment
EXT_sRGB
The definition of 'EXT_sRGB' in that specification.
Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
EXT_sRGBChrome Full support 40Edge No support NoFirefox Full support 58
Full support 58
No support 28 — 58
Notes
Notes Not supported on Windows.
IE No support NoOpera Full support 27Safari Full support 7WebView Android Full support 40Chrome Android Full support 40Firefox Android ? Opera Android Full support 27Safari iOS Full support 7Samsung Internet Android Full support 4.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.

See also

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