These tools effect image blending and masking functionality common in image manipulation applications such as GIMP, Krita, or Photoshop. For a layered image composition GUI based on this functionality, see the parent toolbox linked below.
================== BLENDING FUNCTION ==================
IMBLEND() can blend images or imagesets as one would blend layers in GIMP or Photoshop. See 'help imblend'
I assert that if nothing else, IMBLEND() stands as the single most comprehensive collection and demonstration of blend mode math from GIMP, ImageMagick, Photoshop, Krita, and elsewhere.
Inputs are image arrays of same H,V dimension; both can be single images or 4-D imagesets of equal length.
-- Mismatches of dimensions 1:2 are not supported. Use IMRESIZE, IMCROP, or PADARRAY
to enforce desired colocation of layer content.
-- Mismatches of dimension 3:4 are handled by array expansion.
User can optionally specify compositing method independently of the blend method.
Unlike other image manipulation software, most blend and composition modes have been made parametric. This useful feature may allow the user to tailor the influence of blends in a manner which cannot be acheived using mixdown opacity, or control density/thresholding behavior in composition modes. See the synopsis for details.
This collection of blend modes is comprehensive; if a mode is not on this list, it is likely equivalent to one of the modes that is. The list of supported mode synonyms is in the synopsis.
Submission thumbnail shows contour plots for the majority of the non-component blend modes. Included in the zip file is a PDF containing this sheet as well as parameter sweeps and documentation of mathematical properties and relationships among modes.
gimp compatibility (default)
dissolve (8 variants)
==== Light & Contrast ====
softlight (5 variants)
flat light (3 variants)
mean light (2 variants)
hard mix (3 variants)
==== Quadratic & Complements ====
==== Directional Pairs ====
color dodge & burn
linear dodge & burn
soft dodge & burn (3 variants)
easy dodge & burn
gamma dodge & burn
tint & shade
light & shadow
bright & dark
lighteneb & darkeneb
==== Relational ====
==== Mathematic ====
==== Mesh Modes ====
==== Modulo Modes ====
==== Component ====
color (5 variants)
transfer inchan>outchan (directly transfer any channel to another)
permute inchan>H (rotate hue)
permute inchan>HS (rotate hue and blend saturation)
==== Specialty Modes ====
================== MASKING FUNCTION ==================
Also included is REPLACEPIXELS() which effects an opacity blending similar to GIMP's 'Layer Mask' functionality. Accepts two input images and a mask. Foreground image may be replaced by a color triplet for convenience. REPLACEPIXELS() supports multichannel and multiframe masks, and can support NaN throughput if mask is logical.
Archive includes support functions for image conversion and typecasting. IP Toolbox is used for 'recolor' and 'blurmask' modes in IMBLEND, but is otherwise not required.
Documentation with commentary, example code, and input/output images is available here:
This is part of my image manipulation toolbox:
DGM (2020). Image blending functions (https://www.mathworks.com/matlabcentral/fileexchange/52513-image-blending-functions), MATLAB Central File Exchange. Retrieved .
Inspired by: Colorspace Transformations
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