Gamma#
機能を使用する#
仕組み#
カメラは、次の式(例として示すカラーカメラの赤のピクセル値(R))に従って、各画素の明るさの値にガンマ補正値(γ)を適用します。
最大ピクセル値(Rmax)は、例えば、8ビットピクセルフォーマットの場合は255、10ビットピクセルフォーマットの場合は1023に等しくなります。
Gamma補正の有効化#
ガンマ補正を有効にするには、次の手順に従います。
- パラメーターを
GammaEnable
parameter totrue
((使用している場合)に設定します). - For best results, set the
BlackLevel
parameter to 0. - パラメーターを
Gamma
パラメーターを必要な値に設定します。パラメーター値の範囲は0~約4です。- Gamma = 1:全体の明るさに変化はありません。
- Gamma < 1: The overall brightness increases.
- Gamma > 1:全体の明るさが下がります。
いずれの場合も、黒のピクセル(明るさ = 0)と白のピクセル(明るさ = 最大)は調整されません。
情報
- ガンマ補正を有効にし、ピクセルフォーマットを12ビットピクセルフォーマットに設定すると、一部の画像情報が失われます。ピクセルデータ出力は12ビットのままですが、ガンマ補正処理中にピクセル値が補間されます。
- On boA13440-17cm cameras, gamma correction can only be enabled, if the pixel format is set to an 8-bit pixel format.
追加パラメーター#
カメラのモデルに応じて、次の追加パラメーターを使用できます。
GammaEnable
: Enables or disables gamma correction.Gammaセレクター
:次のいずれかのガンマ補正モードを選択できます。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
またはBslColorSpace
:次のいずれかのガンマ補正モードを選択できます。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 特性 section.
特性#
カメラモデル | 追加パラメーター |
---|---|
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機能はサポートされていません |
boA5120-150cm | Gamma機能はサポートされていません |
boA5120-230cc | Gamma機能はサポートされていません |
boA5120-230cm | Gamma機能はサポートされていません |
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機能はサポートされていません |
boA9344-30cm | Gamma機能はサポートされていません |
boA9344-70cc | Gamma機能はサポートされていません |
boA9344-70cm | Gamma機能はサポートされていません |
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 |
-
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. 例: You have set the light source preset to Tungsten and theGamma
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. -
ピクセルフォーマットがYCbCr422またはRGB8に設定されている場合にのみ使用できます。
-
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 theGamma
parameter value. 例: You set the color space to sRGB and theGamma
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 tosRGB
will also affect the Balance White, Color Adjustment, and Color Transformation features. -
If the color space is set to
sRGB
, a gamma correction value of approximately 0.4 is applied, theGamma
parameter becomes read-only, and theGamma
parameter value is ignored.
サンプルコード#
ace 2, boost, and dart R Cameras#
/* 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);
ace Classic/U/L GigEカメラ#
/* 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);
その他のカメラ#
pylon Viewerを使用して、パラメーターを簡単に設定することもできます。