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Gamma#

The Gamma camera feature allows you to optimize the brightness of acquired images for display on a monitor.

Using the Feature#

How It Works#

The camera applies a gamma correction value (γ) to the brightness value of each pixel according to the following formula (red pixel value (R) of a color camera shown as an example):

Gamma Correction Formula (Red Pixels)

The maximum pixel value (Rmax) equals, e.g., 255 for 8-bit pixel formats or 1 023 for 10-bit pixel formats.

Enabling Gamma Correction#

To enable gamma correction:

  1. Set the GammaEnable parameter to true (if available).
  2. For best results, set the BlackLevel parameter to 0.
  3. Set the Gamma parameter to the desired value. The parameter's value range is 0 to ≈4.
    • Gamma = 1: The overall brightness remains unchanged.
    • Gamma < 1: The overall brightness increases.
    • Gamma > 1: The overall brightness decreases.

In all cases, black pixels (brightness = 0) and white pixels (brightness = maximum) will not be adjusted.

Info

  • If you enable gamma correction and the pixel format is set to a 12-bit pixel format, some image information will be lost. Pixel data output will still be 12-bit, but the pixel values will be interpolated during the gamma correction process.
  • On boA13440-17cm cameras, gamma correction can only be enabled, if the pixel format is set to an 8-bit pixel format.

Additional Parameters#

Depending on your camera model, the following additional parameters are available:

  • GammaEnable: Enables or disables gamma correction.
  • GammaSelector: Allows you to select one of the following gamma correction modes:
    • User: The gamma correction value can be set as desired. (Default.)
    • sRGB: The camera automatically sets a gamma correction value of approximately 0.4. This value is optimized for image display on sRGB monitors.
  • BslColorSpaceMode or BslColorSpace: Allows you to select one of the following gamma correction modes:
    • RGB: No additional gamma correction value is applied.
    • sRGB: The image brightness is optimized for display on an sRGB monitor. A gamma correction value of approximately 0.4 is applied. For more information, see the footnotes in the Specifics section.

Specifics#

Show all camera models

Camera Model Additional Parameters
a2A640-240gmSWIR None
a2A640-240umSWIR None
a2A1280-80gmSWIR None
a2A1280-125umSWIR None
a2A1920-51gcBAS BslColorSpacec
a2A1920-51gcPRO BslColorSpacec
a2A1920-51gmBAS None
a2A1920-51gmPRO None
a2A1920-160ucBAS BslColorSpacec
a2A1920-160ucPRO BslColorSpacec
a2A1920-160umBAS None
a2A1920-160umPRO None
a2A1920-165g5cBAS BslColorSpacec
a2A1920-165g5mBAS None
a2A2048-35gmSWIR None
a2A2048-110umSWIR None
a2A2440-98g5cBAS BslColorSpacec
a2A2440-98g5mBAS None
a2A2448-23gcBAS BslColorSpacec
a2A2448-23gcPRO BslColorSpacec
a2A2448-23gmBAS None
a2A2448-23gmPRO None
a2A2448-75ucBAS BslColorSpacec
a2A2448-75ucPRO BslColorSpacec
a2A2448-75umBAS None
a2A2448-75umPRO None
a2A2448-105g5cBAS BslColorSpacec
a2A2448-105g5mBAS None
a2A2448-120cc BslColorSpacec
a2A2448-120cm None
a2A2448-210cc BslColorSpacec
a2A2448-210cm None
a2A2560-20gmSWIR None
a2A2560-70umSWIR None
a2A2590-22gcBAS BslColorSpacec
a2A2590-22gcPRO BslColorSpacec
a2A2590-22gmBAS None
a2A2590-22gmPRO None
a2A2590-60ucBAS BslColorSpacec
a2A2590-60ucPRO BslColorSpacec
a2A2590-60umBAS None
a2A2590-60umPRO None
a2A2600-20gcBAS BslColorSpacec
a2A2600-20gcPRO BslColorSpacec
a2A2600-20gmBAS None
a2A2600-20gmPRO None
a2A2600-64ucBAS BslColorSpacec
a2A2600-64ucPRO BslColorSpacec
a2A2600-64umBAS None
a2A2600-64umPRO None
a2A2840-14gcBAS BslColorSpacec
a2A2840-14gcPRO BslColorSpacec
a2A2840-14gmBAS None
a2A2840-14gmPRO None
a2A2840-14gmUV None
a2A2840-48ucBAS BslColorSpacec
a2A2840-48ucPRO BslColorSpacec
a2A2840-48umBAS None
a2A2840-48umPRO None
a2A2840-48umUV None
a2A2840-67g5cBAS BslColorSpacec
a2A2840-67g5mBAS None
a2A2840-67g5mUV None
a2A2840-86cc BslColorSpacec
a2A2840-86cm None
a2A3840-13gcBAS BslColorSpacec
a2A3840-13gcPRO BslColorSpacec
a2A3840-13gmBAS None
a2A3840-13gmPRO None
a2A3840-45ucBAS BslColorSpacec
a2A3840-45ucPRO BslColorSpacec
a2A3840-45umBAS None
a2A3840-45umPRO None
a2A4096-9gcBAS BslColorSpacec
a2A4096-9gcPRO BslColorSpacec
a2A4096-9gmBAS None
a2A4096-9gmPRO None
a2A4096-30ucBAS BslColorSpacec
a2A4096-30ucPRO BslColorSpacec
a2A4096-30umBAS None
a2A4096-30umPRO None
a2A4096-44g5cBAS BslColorSpacec
a2A4096-44g5mBAS None
a2A4096-67cc BslColorSpacec
a2A4096-67cm None
a2A4200-12gcBAS BslColorSpacec
a2A4200-12gcPRO BslColorSpacec
a2A4200-12gmBAS None
a2A4200-12gmPRO None
a2A4200-40ucBAS BslColorSpacec
a2A4200-40ucPRO BslColorSpacec
a2A4200-40umBAS None
a2A4200-40umPRO None
a2A4504-5gcBAS BslColorSpacec
a2A4504-5gcPRO BslColorSpacec
a2A4504-5gmBAS None
a2A4504-5gmPRO None
a2A4504-18ucBAS BslColorSpacec
a2A4504-18ucPRO BslColorSpacec
a2A4504-18umBAS None
a2A4504-18umPRO None
a2A4504-27g5cBAS BslColorSpacec
a2A4504-27g5mBAS None
a2A4504-42cc BslColorSpacec
a2A4504-42cm None
a2A4508-6gcBAS BslColorSpacec
a2A4508-6gcPRO BslColorSpacec
a2A4508-6gmBAS None
a2A4508-6gmPRO None
a2A4508-20ucBAS BslColorSpacec
a2A4508-20ucPRO BslColorSpacec
a2A4508-20umBAS None
a2A4508-20umPRO None
a2A5320-7gcBAS BslColorSpacec
a2A5320-7gcPRO BslColorSpacec
a2A5320-7gmBAS None
a2A5320-7gmPRO None
a2A5320-23ucBAS BslColorSpacec
a2A5320-23ucPRO BslColorSpacec
a2A5320-23umBAS None
a2A5320-23umPRO None
a2A5320-34g5cBAS BslColorSpacec
a2A5320-34g5mBAS None
a2A5320-52cc BslColorSpacec
a2A5320-52cm None
a2A5328-4gcBAS BslColorSpacec
a2A5328-4gcPRO BslColorSpacec
a2A5328-4gmBAS None
a2A5328-4gmPRO None
a2A5328-15ucBAS BslColorSpacec
a2A5328-15ucPRO BslColorSpacec
a2A5328-15umBAS None
a2A5328-15umPRO None
a2A5328-22g5cBAS BslColorSpacec
a2A5328-22g5mBAS None
a2A5328-35cc BslColorSpacec
a2A5328-35cm None
acA640-121gm GammaEnable
GammaSelector
acA640-300gc GammaEnable
GammaSelector
acA640-300gm GammaEnable
GammaSelector
acA640-750uc Nonea
acA640-750um Nonea
acA720-290gc GammaEnable
GammaSelector
acA720-290gm GammaEnable
GammaSelector
acA720-520uc Nonea
acA720-520um Nonea
acA800-200gc GammaEnable
GammaSelector
acA800-200gm GammaEnable
GammaSelector
acA800-510uc Nonea
acA800-510um Nonea
acA1280-60gc GammaEnable
GammaSelector
acA1280-60gm GammaEnable
GammaSelector
acA1300-60gc GammaEnable
GammaSelector
acA1300-60gm GammaEnable
GammaSelector
acA1300-60gmNIR GammaEnable
GammaSelector
acA1300-75gc GammaEnable
GammaSelector
acA1300-75gm GammaEnable
GammaSelector
acA1300-200uc Nonea
acA1300-200um Nonea
acA1440-73gc GammaEnable
GammaSelector
acA1440-73gm GammaEnable
GammaSelector
acA1440-220uc Nonea
acA1440-220um Nonea
acA1600-20gc GammaEnable
GammaSelector
acA1600-20uc Nonea
acA1600-60gc GammaEnable
GammaSelector
acA1600-60gm GammaEnable
GammaSelector
acA1920-25gc GammaEnable
GammaSelector
acA1920-25gm GammaEnable
GammaSelector
acA1920-25uc Nonea
acA1920-25um Nonea
acA1920-40gc GammaEnable
GammaSelector
acA1920-40gm GammaEnable
GammaSelector
acA1920-40uc Nonea
acA1920-40ucMED Nonea
acA1920-40um Nonea
acA1920-40umMED Nonea
acA1920-48gc GammaEnable
GammaSelector
acA1920-48gm GammaEnable
GammaSelector
acA1920-50gc GammaEnable
GammaSelector
acA1920-50gm GammaEnable
GammaSelector
acA1920-150uc Nonea
acA1920-150um Nonea
acA1920-155uc Nonea
acA1920-155ucMED Nonea
acA1920-155um Nonea
acA1920-155umMED Nonea
acA2000-50gc GammaEnable
GammaSelector
acA2000-50gm GammaEnable
GammaSelector
acA2000-165uc Nonea
acA2000-165um Nonea
acA2040-25gc GammaEnable
GammaSelector
acA2040-25gm GammaEnable
GammaSelector
acA2040-25gmNIR GammaEnable
GammaSelector
acA2040-35gc GammaEnable
GammaSelector
acA2040-35gm GammaEnable
GammaSelector
acA2040-55uc Nonea
acA2040-55um Nonea
acA2040-90uc Nonea
acA2040-90um Nonea
acA2040-90umNIR Nonea
acA2040-120uc Nonea
acA2040-120um Nonea
acA2440-20gc GammaEnable
GammaSelector
acA2440-20gm GammaEnable
GammaSelector
acA2440-35uc Nonea
acA2440-35ucMED Nonea
acA2440-35um Nonea
acA2440-35umMED Nonea
acA2440-75uc Nonea
acA2440-75ucMED Nonea
acA2440-75um Nonea
acA2440-75umMED Nonea
acA2500-14gc GammaEnable
GammaSelector
acA2500-14gm GammaEnable
GammaSelector
acA2500-14uc Nonea
acA2500-14um Nonea
acA2500-20gc GammaEnable
GammaSelector
acA2500-20gcMED GammaEnable
GammaSelector
acA2500-20gm GammaEnable
GammaSelector
acA2500-20gmMED GammaEnable
GammaSelector
acA2500-60uc Nonea
acA2500-60um Nonea
acA3088-16gc GammaEnable
GammaSelector
acA3088-16gm GammaEnable
GammaSelector
acA3088-57uc Nonea
acA3088-57ucMED Nonea
acA3088-57um Nonea
acA3088-57umMED Nonea
acA3800-10gc GammaEnable
GammaSelector
acA3800-10gm GammaEnable
GammaSelector
acA3800-14uc Nonea
acA3800-14um Nonea
acA4024-8gc GammaEnable
GammaSelector
acA4024-8gm GammaEnable
GammaSelector
acA4024-29uc Nonea
acA4024-29um Nonea
acA4096-11gc GammaEnable
GammaSelector
acA4096-11gm GammaEnable
GammaSelector
acA4096-30uc Nonea
acA4096-30ucMED Nonea
acA4096-30um Nonea
acA4096-30umMED Nonea
acA4096-40uc Nonea
acA4096-40ucMED Nonea
acA4096-40um Nonea
acA4096-40umMED Nonea
acA4112-8gc GammaEnable
GammaSelector
acA4112-8gm GammaEnable
GammaSelector
acA4112-20uc Nonea
acA4112-20ucMED Nonea
acA4112-20um Nonea
acA4112-20umMED Nonea
acA4112-30uc Nonea
acA4112-30ucMED Nonea
acA4112-30um Nonea
acA4112-30umMED Nonea
acA5472-5gc GammaEnable
GammaSelector
acA5472-5gm GammaEnable
GammaSelector
acA5472-17uc Nonea
acA5472-17ucMED Nonea
acA5472-17um Nonea
acA5472-17umMED Nonea
boA1936-400cc BslColorSpacec
boA1936-400cm None
boA2448-250cc BslColorSpacec
boA2448-250cm None
boA2832-190cc BslColorSpacec
boA2832-190cm None
boA4096-93cc BslColorSpacec
boA4096-93cm None
boA4096-180cc BslColorSpacec
boA4096-180cm None
boA4112-68cc BslColorSpacec
boA4112-68cm None
boA4500-45cc BslColorSpacec
boA4500-45cm None
boA4504-100cc BslColorSpacec
boA4504-100cm None
boA5120-150cc Gamma feature not supported
boA5120-150cm Gamma feature not supported
boA5120-230cc Gamma feature not supported
boA5120-230cm Gamma feature not supported
boA5320-150cc BslColorSpacec
boA5320-150cm None
boA5328-100cc BslColorSpacec
boA5328-100cm None
boA6500-36cc BslColorSpacec
boA6500-36cm None
boA8100-16cc BslColorSpacec
boA8100-16cm None
boA9344-30cc Gamma feature not supported
boA9344-30cm Gamma feature not supported
boA9344-70cc Gamma feature not supported
boA9344-70cm Gamma feature not supported
boA13440-17cm None
daA720-520uc BslColorSpacea
daA720-520um None
daA1280-54uc BslColorSpaceModeb
daA1280-54um None
daA1440-220uc BslColorSpacea
daA1440-220um None
daA1600-60uc BslColorSpaceModeb
daA1600-60um None
daA1920-15um None
daA1920-30uc BslColorSpaceModeb
daA1920-30um None
daA1920-160uc BslColorSpacea
daA1920-160um None
daA2448-70uc BslColorSpacea
daA2448-70um None
daA2500-14uc BslColorSpaceModeb
daA2500-14um None
daA3840-45uc BslColorSpacea
daA3840-45um None
dmA720-290gc BslColorSpacec
dmA720-290gm None
dmA1440-73gc BslColorSpacec
dmA1440-73gm None
dmA1920-51gc BslColorSpacec
dmA1920-51gm None
puA1280-54uc BslColorSpaceModeb
puA1280-54um None
puA1600-60uc BslColorSpaceModeb
puA1600-60um None
puA1920-30uc BslColorSpaceModeb
puA1920-30um None
puA2500-14uc BslColorSpaceModeb
puA2500-14um None
r2L2048-29gc BslColorSpacec
r2L2048-58gm None
r2L2048-62cc BslColorSpacec
r2L2048-62g5c BslColorSpacec
r2L2048-172cm None
r2L2048-172g5m None
r2L4096-14gc BslColorSpacec
r2L4096-29gm None
r2L4096-42cc BslColorSpacec
r2L4096-42g5c BslColorSpacec
r2L4096-84cm None
r2L4096-84g5m None
r2L8192-200cm None
r2L16384-120cm None

  1. If you select a light source preset, an additional gamma correction value of approximately 0.4 is applied (sRGB gamma correction). This value is applied separately and not included in the Gamma parameter value. Example: You have set the light source preset to Tungsten and the Gamma parameter value to 1.2. First, an automatic correction value of approximately 0.4 is applied to the pixel values. After that, a gamma correction value of 1.2 is applied to the resulting pixel values.

  2. Only available if the pixel format is set to YCbCr422 or RGB8.

  3. If the color space is set to sRGB, a gamma correction value of approximately 0.4 is applied. This value is applied separately and not included in the Gamma parameter value. Example: You set the color space to sRGB and the Gamma parameter to 1.2. First, an automatic correction value of approximately 0.4 is applied to the pixel values. After that, a gamma correction value of 1.2 is applied to the resulting pixel values.
    If you have selected a Light Source Preset, setting the color space to sRGB will also affect the Balance White, Color Adjustment, and Color Transformation features.

  4. If the color space is set to sRGB, a gamma correction value of approximately 0.4 is applied, the Gamma parameter becomes read-only, and the Gamma parameter value is ignored.

Sample Code#

ace 2, boost, and dart R Cameras#
// Set the Gamma value to 1.2
camera.Gamma.SetValue(1.2);
// Set the color space to sRGB
camera.BslColorSpace.SetValue(BslColorSpace_sRGB);
INodeMap& nodemap = camera.GetNodeMap();
// Set the Gamma value to 1.2
CFloatParameter(nodemap, "Gamma").SetValue(1.2);
// Set the color space to sRGB
CEnumParameter(nodemap, "BslColorSpace").SetValue("sRGB");
// Set the Gamma value to 1.2
camera.Parameters[PLCamera.Gamma].SetValue(1.2);
// Set the color space to sRGB
camera.Parameters[PLCamera.BslColorSpace].SetValue(PLCamera.BslColorSpace.sRGB);
/* Macro to check for errors */
#define CHECK(errc) if (GENAPI_E_OK != errc) printErrorAndExit(errc)
GENAPIC_RESULT errRes = GENAPI_E_OK;  /* Return value of pylon methods */
/* Set the Gamma value to 1.2 */
errRes = PylonDeviceSetFloatFeature(hdev, "Gamma", 1.2);
CHECK(errRes);
/* Set the color space to sRGB */
errRes = PylonDeviceFeatureFromString(hdev, "BslColorSpace", "sRGB");
CHECK(errRes);
# Set the Gamma value to 1.2
camera.Gamma.Value = 1.2
# Set the color space to sRGB
camera.BslColorSpace.Value = "sRGB"
ace Classic/U/L GigE Cameras#
// Enable the Gamma feature
camera.GammaEnable.SetValue(true);
// Set the gamma type to User
camera.GammaSelector.SetValue(GammaSelector_User);
// Set the Gamma value to 1.2
camera.Gamma.SetValue(1.2);
INodeMap& nodemap = camera.GetNodeMap();
// Enable the Gamma feature
CBooleanParameter(nodemap, "GammaEnable").SetValue(true);
// Set the gamma type to User
CEnumParameter(nodemap, "GammaSelector").SetValue("User");
// Set the Gamma value to 1.2
CFloatParameter(nodemap, "Gamma").SetValue(1.2);
// Enable the Gamma feature
camera.Parameters[PLCamera.GammaEnable].SetValue(true);
// Set the gamma type to User
camera.Parameters[PLCamera.GammaSelector].SetValue(PLCamera.GammaSelector.User);
// Set the Gamma value to 1.2
camera.Parameters[PLCamera.Gamma].SetValue(1.2);
/* Macro to check for errors */
#define CHECK(errc) if (GENAPI_E_OK != errc) printErrorAndExit(errc)
GENAPIC_RESULT errRes = GENAPI_E_OK;  /* Return value of pylon methods */
/* Enable the Gamma feature */
errRes = PylonDeviceSetBooleanFeature(hdev, "GammaEnable", 1);
CHECK(errRes);
/* Set the gamma type to User */
errRes = PylonDeviceFeatureFromString(hdev, "GammaSelector", "User");
CHECK(errRes);
/* Set the Gamma value to 1.2 */
errRes = PylonDeviceSetFloatFeature(hdev, "Gamma", 1.2);
CHECK(errRes);
# Enable the Gamma feature
camera.GammaEnable.Value = True
# Set the gamma type to User
camera.GammaSelector.Value = "User"
# Set the Gamma value to 1.2
camera.Gamma.Value = 1.2
Other Cameras#
// Set the Gamma value to 1.2
camera.Gamma.SetValue(1.2);
INodeMap& nodemap = camera.GetNodeMap();
// Set the Gamma value to 1.2
CFloatParameter(nodemap, "Gamma").SetValue(1.2);
// Set the Gamma value to 1.2
camera.Parameters[PLCamera.Gamma].SetValue(1.2);
/* Macro to check for errors */
#define CHECK(errc) if (GENAPI_E_OK != errc) printErrorAndExit(errc)
GENAPIC_RESULT errRes = GENAPI_E_OK;  /* Return value of pylon methods */
/* Set the Gamma value to 1.2 */
errRes = PylonDeviceSetFloatFeature(hdev, "Gamma", 1.2);
CHECK(errRes);
# Set the Gamma value to 1.2
camera.Gamma.Value = 1.2

You can also use the pylon Viewer to easily set the parameters.