PixInsight - Finalizing the Image

Histogram Stretch

updated: 2024-03-13


Purpose

Performing a full stretch on linear images

Activation

Menu: Process 🡺 All Processes 🡺 HistogramTransformation

Process Explorer: IntensityTransformations 🡺 ScreenTransferFunction

Input

Corrected image, file name “*_i_c_DBE_BN_CC_HT.xisf” or similar into sub folder "work"

Plus masked image from previous step with protected foreground

Output

Stretched image, file name “*_i_c_DBE_ABE_BN_CC_HT_MLT_FULL.xisf” 

and exported  *_FULL.jpg"  into sub folder "work"

Previous Step

Next Step

Tutorial

Stretching an image with Histrogram Transformation in Pixinsight (youtube.com)


Step

Action

Description

1

Open the processed image and unstretch it

(20221029-233853_M33_ZWOASI294_0002_SPCC_NXBX.xisf in this example)

🡺 🡺

2

Open Histogram Transformation (HT)

and reset the function

3

Select the current image

4

Enable Real Time Preview


5

Drag the middle slider to the left 

until a clearly visible image appears or until it reaches the right-hand sloping edge of the histogram

6

Apply the settings
Drag the little blue triangle on your image

6

Reset HT

to reduce the couple stretch in the preview window

🡺  

7

Drag the left slider to the right 
until a clearly visible image appears or until it reaches the left-hand rising edge of the histogram

 🡺  

8

Drag the middle slider to the left again

until it reaches the right-hand sloping edge of the histogram


              v

 

9

Apply the settings
Drag the little blue triangle on your image


10

Repeat the steps 5 through 9 again

until you are happy with the result.



 

11

Close the Realtime Preview Window

and reset HT


12

Close HistogramTransform


13

Save the fully stretched image

file name like “*_FULL.xisf” or similar into sub folder "work"

(or 20221029-233853_M33_ZWOASI294_0002_SPCC_NXBX_FULL_HT.xisf in this case)

15

Export the final image to JPEG format

file name like “*_FULL.jpgf” or similar into sub folder "work"

(or 20221029-233853_M33_ZWOASI294_0002_SPCC_NXBX_FULL_HT.jpg in this case)

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