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kolrabi's another Image Library
1.11.0
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kolrabi's another Image Library
1.11.0
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Colour corrections. More...
Functions | |
| ILuint ILAPIENTRY | iluColoursUsed () |
| Returns the number of colours used in the current image. More... | |
| ILboolean ILAPIENTRY | iluContrast (ILfloat Contrast) |
| changes the contrast of an image by using interpolation and extrapolation. More... | |
| ILboolean ILAPIENTRY | iluEqualize () |
| Equalizes the intensity distribution in the histogram of an image. More... | |
| ILboolean ILAPIENTRY | iluGammaCorrect (ILfloat Gamma) |
| Performs gamma correction of an image. More... | |
| ILboolean ILAPIENTRY | iluHistogram (ILuint *Values, ILuint Count) |
| Get a histogram of an image. More... | |
| ILboolean ILAPIENTRY | iluInvertAlpha () |
| Inverts the alpha in the image. More... | |
| ILboolean ILAPIENTRY | iluNegative () |
| Inverts the colours in the image. | |
| ILboolean ILAPIENTRY | iluNormalize () |
| Normalizes the intensities in an image. More... | |
| ILboolean ILAPIENTRY | iluSaturate1f (ILfloat Saturation) |
| Modifies the color saturation of an image. More... | |
| ILboolean ILAPIENTRY | iluSaturate4f (ILfloat r, ILfloat g, ILfloat b, ILfloat Saturation) |
| Modifies the color saturation of an image. More... | |
| ILboolean ILAPIENTRY | iluScaleAlpha (ILfloat scale) |
| Scales the alpha components of the current bound image. More... | |
| ILboolean ILAPIENTRY | iluScaleColours (ILfloat r, ILfloat g, ILfloat b) |
| Scales the individual colour components of the current bound image. More... | |
| ILboolean ILAPIENTRY | iluSwapColours () |
| "Swaps" the colour order of the current image. More... | |
Colour corrections.
Brightness, contrast, gamma, etc.
| ILuint ILAPIENTRY iluColoursUsed | ( | ) |
Returns the number of colours used in the current image.
Creates a copy of the image data, quicksorts it and counts the number of unique colours in the image. This value is returned without affecting the original image.
| ILboolean ILAPIENTRY iluContrast | ( | ILfloat | Contrast | ) |
changes the contrast of an image by using interpolation and extrapolation.
Common values for Contrast are in the range -0.5 to 1.7. Anything below 0.0 generates a negative of the image with varying contrast. 1.0 outputs the original image. 0.0 - 1.0 lowers the contrast of the image. 1.0 - 1.7 increases the contrast of the image. This effect is caused by interpolating (or extrapolating) the source image with a totally grey image.
| ILboolean ILAPIENTRY iluEqualize | ( | ) |
Equalizes the intensity distribution in the histogram of an image.
The lowest intensity will result in black and the highest in white.
| ILboolean ILAPIENTRY iluGammaCorrect | ( | ILfloat | Gamma | ) |
Performs gamma correction of an image.
If Gamma is less than 1.0, the image is darkened. If Gamma is greater than 1.0, the image is brightened.
| ILboolean ILAPIENTRY iluHistogram | ( | ILuint * | Values, |
| ILuint | Count | ||
| ) |
Get a histogram of an image.
Will store one value per channel spread over to whole supplied array.
| Values | Where to store the pixel counts. |
| Count | Number of entries in the value array, must be a multiple of the image's (or its palette's) number of channels. |
| ILboolean ILAPIENTRY iluInvertAlpha | ( | ) |
Inverts the alpha in the image.
Image must already have a valid alpha channel.
| ILboolean ILAPIENTRY iluNormalize | ( | ) |
Normalizes the intensities in an image.
The lowest intensity will result in black and the highest in white.
| ILboolean ILAPIENTRY iluSaturate1f | ( | ILfloat | Saturation | ) |
Modifies the color saturation of an image.
Applies a saturation consistent with the IL_LUMINANCE conversion values to red, green and blue. All parameters go from -1.0 to 1.0.
| ILboolean ILAPIENTRY iluSaturate4f | ( | ILfloat | r, |
| ILfloat | g, | ||
| ILfloat | b, | ||
| ILfloat | Saturation | ||
| ) |
Modifies the color saturation of an image.
Applies saturation to the colour components in the amounts specified. All parameters go from -1.0 to 1.0.
| ILboolean ILAPIENTRY iluScaleAlpha | ( | ILfloat | scale | ) |
Scales the alpha components of the current bound image.
Using 1.0f as the parameter yields that the original alpha value.
| ILboolean ILAPIENTRY iluScaleColours | ( | ILfloat | r, |
| ILfloat | g, | ||
| ILfloat | b | ||
| ) |
Scales the individual colour components of the current bound image.
Using 1.0f as any of the parameters yields that colour component's original plane in the new image.
| ILboolean ILAPIENTRY iluSwapColours | ( | ) |
"Swaps" the colour order of the current image.
If the current image is in bgr(a) format, iluSwapColours will change the image to use rgb(a) format, or vice-versa. This can be helpful when you want to manipulate the image data yourself but only want to use a certain colour order. To determine the current colour order, call ilGetInteger with the IL_IMAGE_FORMAT parameter.
1.8.6 
