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60 Second Tip: How to Identify Pixels Within a Given Luminosity Range

Disciplines > Photography > Affinity Photo > The InAffinity Video Index > 60 Second Tip: How to Identify Pixels Within a Given Luminosity Range

Summary | Video | Detail | See also

Summary

Sometimes you want to know which pixels are within a given luminosity range, say between 25% and 30% lightness. Here is a dynamic and easy way to do this. The result can consequently be used for such as masking and targeted edits.

Video

Click image to watch on YouTube:

Detail

Publication Date: 30-Dec-21

Duration: 0:57

This method uses two copies of the image and two Threshold layers to set the lower and upper limits, and then using the Difference blend mode to see the range selected. Note that the result is hard edged.

If needed, you can create a mask through Merge Visible and Rasterise to Mask, then blur it as needed to soften the edges and then invert the mask and paint back (with white) on the mask to use it only in selected areas.

See also

Affinity Photo Tutorials on 60 Second Tips

Affinity Photo Tutorials on Luminosity Masking

Affinity Photo Tutorials on Masking

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Site Menu

| Home | Top | Quick Links | Settings |

Main sections: | Disciplines | Techniques | Principles | Explanations | Theories |

Other sections: | Blog! | Quotes | Guest articles | Analysis | Books | Help |

More pages: | Contact | Caveat | About | Students | Webmasters | Awards | Guestbook | Feedback | Sitemap | Changes |

Settings: | Computer layout | Mobile layout | Small font | Medium font | Large font | Translate |

Please help and share:

Quick links

Disciplines

* Argument
* Brand management
* Change Management
* Coaching
* Communication
* Counseling
* Game Design
* Human Resources
* Job-finding
* Leadership
* Marketing
* Politics
* Propaganda
* Rhetoric
* Negotiation
* Psychoanalysis
* Sales
* Sociology
* Storytelling
* Teaching
* Warfare
* Workplace design

Techniques

* Assertiveness
* Body language
* Change techniques
* Closing techniques
* Conversation
* Confidence tricks
* Conversion
* Creative techniques
* General techniques
* Happiness
* Hypnotism
* Interrogation
* Language
* Listening
* Negotiation tactics
* Objection handling
* Propaganda
* Problem-solving
* Public speaking
* Questioning
* Using repetition
* Resisting persuasion
* Self-development
* Sequential requests
* Storytelling
* Stress Management
* Tipping
* Using humor
* Willpower

Principles

Explanations

* Behaviors
* Beliefs
* Brain stuff
* Conditioning
* Coping Mechanisms
* Critical Theory
* Culture
* Decisions
* Emotions
* Evolution
* Gender
* Games
* Groups
* Habit
* Identity
* Learning
* Meaning
* Memory
* Motivation
* Models
* Needs
* Personality
* Power
* Preferences
* Research
* Relationships
* SIFT Model
* Social Research
* Stress
* Trust
* Values

Theories

* Alphabetic list
* Theory types

And

– About
– Guest Articles
– Blog!
– Books
– Changes
– Contact
– Guestbook
– Quotes
– Students
– Webmasters

| Home | Top | Menu | Quick Links |

© Changing Works 2002-
Massive Content — Maximum Speed