Example 12 - Constant Contrast

Up \| Example 01 - Calculate Area \| Example 02 - Calculate mean value \| Example 03 - Manipulate the results from two LineFinders \| Example 04 - Dynamic threshold \| Example 05 - Auto Exposure \| Example 06 - DrawLine \| Example 07 - Overlays \| Example 08 - Python Objects \| Example 09 - Timing \| Example 10 - Image Averaging \| Example 11 - Image Resampling \| Example 12 - Constant Contrast \| Example 13 - Serial Communication \| Example 14 - Python results \| Example 15 - Making a result string \| Example 16 - Running tools from a script \| Example 17 - Image Manipulation using Python Scripting \| Example 18 - Calculating the median angle \| Example 19 - Iterating objects located by a blob \| Example 20 - Resampling using non-linear calibration \| Example 21 - Custom Scorpion Python extension \| Example 22 - Accessing Image Pixels \| Example 23 - Implementing a tcp/ip Socket Server \| Example 24 - Setting ExternalReference from calculated four points \| Example 25 - Rotating a reference around in a circle \| Example 26 - Grabbing an image from an MOXA Video IP Server \| Example 27 - Toolbox Switch \| Example 28 - Color Matcher Iteration \| Example 29 - Audio Notification \| Example 30 - Windows MessageBox \| Example 31 - Client to tcp Socket Server \| Example 32 - Read / Write External Data from / to file \| Example 33 - Changing a tool's ROI \| Example 34 - Histogram Equalization \| Example 35 - Robust Adam 6060 scripts \| Example 36 - Bubblesort \| Example 37 - Element Statistics \| Example 38 - Saving 3D Image \| Example 39 - Disabling Zoom in Image Windows \| Example 40 - Filtering timeseries \| Example 41 - Scorpion Watchdog keep system running \| Example 42 - Binary Search \| Example 43 - Creating an ordered pointcloud \| Example 44 - UDP Socket Communication

Example 12 - Constant Contrast

This example is provided to show how to adjust the contrast of an image

import arr
def AdjustContrast(imageName,low,high):
contrast = high - low

# based on constrast a gain factor is given
# the low intensity value of the adjusted image is 40
# the high intensity value is 40 + 170 = 210
lgain = 170.0/contrast
lOffset = 40 - low * lgain

# adjust the contrast of Image
im1 = arr.toFloat(GetImageMatr(imageName))
im1 *= lgain
im1 += lOffset
SetImageMatr(imageName,im1.rangeToUint8(0,255))