Recent changes to Blend Modes

Blend Modes modified by skepticalee

skepticalee — Fri, 20 Sep 2019 08:42:24 -0000

--- v30
+++ v31
@@ -297,3 +297,4 @@
 5.  Blend modes that were not used are all the Duff-Porter modes (destination_\*, source_\*) and average (since this can be emulated by "normal" and setting the opacity to 0.50).

 ![](https://www.skeptic.de/counter.php?sid=Volpe_Blend_modes)
+![](https://vg02.met.vgwort.de/na/03fa1d2816434fbc97b7da7842b81527)

Blend Modes modified by skepticalee

skepticalee — Fri, 20 Sep 2019 08:41:00 -0000

--- v29
+++ v30
@@ -296,4 +296,4 @@
 4.  All Imagick constants require a leading string "imagick::COMPOSITE_". 
 5.  Blend modes that were not used are all the Duff-Porter modes (destination_\*, source_\*) and average (since this can be emulated by "normal" and setting the opacity to 0.50).

-![alt text](https://www.skeptic.de/counter.php?sid=Volpe_Blend_modes)
+![](https://www.skeptic.de/counter.php?sid=Volpe_Blend_modes)

Blend Modes modified by skepticalee

skepticalee — Sun, 30 Sep 2018 18:10:55 -0000

--- v28
+++ v29
@@ -13,6 +13,8 @@
 |

 #####Add
+ Imagick constant `plus`.
+
 VOLPaper |Imagick
 ---------- | ----------
 |

Blend Modes modified by skepticalee

skepticalee — Sun, 30 Sep 2018 18:04:21 -0000

--- v27
+++ v28
@@ -129,7 +129,7 @@
 |

-####Imagick blend modes that were added to PaperLT
+####Imagick blend modes that were added to VOLPaper
 #####Divide

 VOLPaper |Imagick
@@ -193,7 +193,7 @@
 |

-####Blend modes added to both Imagick and PaperLT
+####Blend modes added to both Imagick and VOLPaper
 #####Grain-extract
 Imagick constant `mathematics` with corresponding formula.

Blend Modes modified by skepticalee

skepticalee — Sun, 30 Sep 2018 18:02:02 -0000

--- v26
+++ v27
@@ -2,94 +2,94 @@

 Paperjs provides a number of blend modes for controlling how an effect (raster or text) is rendered onto the film sequence. The point of VOLPE is not to pre-render a film sequence, but to give as good an emulation as possible of the opening scene, so that position, size, and blending mode can be adjusted for the desired effect.

-Once, however, the blend modes are produced by Paperjs, they need to be implemented as closely as possible in Imagick. And this is where the problems lay. Some Paperjs blend modes were quite easy to find in  Imagick; others were completely orthogonal. Imagick has more blend modes than Paperjs, so that the formulae had to be discovered and implemented in a special version of Paperjs, PaperLT, which is provided with this distribution .
+Once, however, the blend modes are produced by Paperjs, they need to be implemented as closely as possible in Imagick. And this is where the problems lay. Some Paperjs blend modes were quite easy to find in  Imagick; others were completely orthogonal. Imagick has more blend modes than Paperjs, so that the formulae had to be discovered and implemented in a special version of Paperjs, VOLPaper, which is provided with this distribution .

 ####Agreement: Paperjs blendmodes that could be implemented almost directly in Imagick
 #####Normal
 Imagick constant `default`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Add
-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Color-burn
 Paperjs code here was simplified by using `Math.max()` instead of a comparison. Imagick constant `colorburn`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Color-dodge
 Paperjs code here was simplified by using `Math.min()` instead of a comparison. Imagick constant `colordodge`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Darken
 Paperjs code here was simplified by using `Math.min()` instead of a comparison.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Difference
 Paperjs code here was simplified by using `Math.abs()` instead of a subtraction, comparison, and multiplication.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Exclusion
 Paperjs code here was simplified by using a multiplication instead of a repeated substraction.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Hard-light
 Imagick constant `hardlight`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Lighten
 Paperjs code here was simplified by using `Math.max()` instead of a comparison.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Multiply
-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Minus
-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Overlay
-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Screen
-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Soft-light
 Imagick constant `softlight`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

@@ -104,27 +104,27 @@
 #####Color
 Imagick constant `colorize`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Hue

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Luminosity
 Imagick constant `luminize`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Saturation 
 Imagick constant `saturate`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

@@ -132,63 +132,63 @@
 ####Imagick blend modes that were added to PaperLT
 #####Divide

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Divide-src
 This required copying opacity. Imagick constant `dividesrc`.

-PaperLT |Imagick|w/o opacity copying
+VOLPaper |Imagick|w/o opacity copying
 ---------- | ----------| ----------
 ||

 #####Linear-burn
 Imagick constant `linearburn`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Linear-light
 Imagick constant `linearlight`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Pegtop-light
 Imagick constant `pegtoplight`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Pin-light
 Imagick constant `pinlight`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Vivid-light
 This required copying opacity. Imagick constant `vividlight`.

-PaperLT |Imagick|w/o opacity copying
+VOLPaper |Imagick|w/o opacity copying
 ---------- | ----------| ----------
 ||

 #####Darken-intensity
 This required copying opacity. Imagick constant `darkenintensity`.

-PaperLT |Imagick|w/o opacity copying
+VOLPaper |Imagick|w/o opacity copying
 ---------- | ----------| ----------
 ||

 #####Lighten-intensity
 Imagick constant `lightenintensity`.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

@@ -197,77 +197,77 @@
 #####Grain-extract
 Imagick constant `mathematics` with corresponding formula.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Grain-extract-src
 Imagick constant `mathematics` with corresponding formula.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Grain-merge
 Imagick constant `mathematics` with corresponding formula.

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Divide-intensity
 This required copying opacity. 

-PaperLT |Imagick|w/o opacity copying
+VOLPaper |Imagick|w/o opacity copying
 ---------- | ----------| ----------
 ||

 #####Multiply-intensity

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Negation-src

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Negation-sum

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Overlay-intensity

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Overlay-intensity-src

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Screen-intensity

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 #####Screen-intensity-src

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

 ####Blend mode that failed to produce anything reasonable in Paperjs
 #####Negate

-PaperJS original |PaperLT |Imagick
+PaperJS original |VOLPaper |Imagick
 ---------- |---------- | ----------
 ||

@@ -276,14 +276,14 @@

 The use of the `subtract` constant resulted in an unusable image which was identical to the result produced by `modulussubtract`, but `minussrc` worked as intended.

-PaperLT |Imagick|Imagick original
+VOLPaper |Imagick|Imagick original
 ---------- | ----------| ----------
 ||

 ####Blend mode that produced insufficient agreement between Imagick and Paperjs and was not implemented
 #####Hard-mix

-PaperLT |Imagick
+VOLPaper |Imagick
 ---------- | ----------
 |

Blend Modes modified by skepticalee

skepticalee — Wed, 12 Sep 2018 20:19:18 -0000

--- v25
+++ v26
@@ -288,7 +288,7 @@
 |

 ####Notes
-1.  While results are not 100% identical, care has been taken to achieve an effect that is as near as dammit. Images can be overlaid with grain extract to determine any deviations, but keep in mind that Paperjs's pixel positions are rarely integers, and minor differences will be found. Also, as I have complained to the makers of Paperjs, Paperjs adds an undetermined gamma to all images, brightening them by about 5%,
+1.  While results are not 100% identical, care has been taken to achieve an effect that is as near as dammit. Images can be overlaid with grain extract to determine any deviations, but keep in mind that Paperjs's pixel positions are rarely integers, and minor differences will be found. Also, as I have complained to the makers of Paperjs, Paperjs applies an undetermined gamma to all images, brightening them in the mid ranges by about 5%.
 2.  "Intensity" modes are based on a gray-scaling according to the rec601luma formula (0.299/0.587/0.114 for RGB).
 3.  "Src" modes are analogous to Imagick's "SRC" modes in defining source and destination images.
 4.  All Imagick constants require a leading string "imagick::COMPOSITE_".

Blend Modes modified by skepticalee

skepticalee — Wed, 12 Sep 2018 19:54:22 -0000

--- v24
+++ v25
@@ -288,7 +288,7 @@
 |

 ####Notes
-1.  While results are not 100% identical, care has been taken to achieve an effect that is as near as dammit. Images can be overlaid with grain extract to determine any deviations, but keep in mind that Paperjs's pixel positions are rarely integers, and minor differences will be found.
+1.  While results are not 100% identical, care has been taken to achieve an effect that is as near as dammit. Images can be overlaid with grain extract to determine any deviations, but keep in mind that Paperjs's pixel positions are rarely integers, and minor differences will be found. Also, as I have complained to the makers of Paperjs, Paperjs adds an undetermined gamma to all images, brightening them by about 5%,
 2.  "Intensity" modes are based on a gray-scaling according to the rec601luma formula (0.299/0.587/0.114 for RGB).
 3.  "Src" modes are analogous to Imagick's "SRC" modes in defining source and destination images.
 4.  All Imagick constants require a leading string "imagick::COMPOSITE_".

Blend Modes modified by skepticalee

skepticalee — Sun, 09 Sep 2018 15:58:12 -0000

--- v23
+++ v24
@@ -294,4 +294,4 @@
 4.  All Imagick constants require a leading string "imagick::COMPOSITE_". 
 5.  Blend modes that were not used are all the Duff-Porter modes (destination_\*, source_\*) and average (since this can be emulated by "normal" and setting the opacity to 0.50).

-![alt text](https://www.skeptic.de/counter.php?sid=Volpe_Blending_modes)
+![alt text](https://www.skeptic.de/counter.php?sid=Volpe_Blend_modes)

Blend Modes modified by skepticalee

skepticalee — Sun, 09 Sep 2018 10:37:51 -0000

--- v22
+++ v23
@@ -274,7 +274,7 @@
 ####Blend mode that failed to produce anything reasonable in Imagick
 #####Subtract

-The `subtract` constant reulted in an unusable image, but `minussrc`worked as intended.
+The use of the `subtract` constant resulted in an unusable image which was identical to the result produced by `modulussubtract`, but `minussrc` worked as intended.

 PaperLT |Imagick|Imagick original
 ---------- | ----------| ----------

Blend Modes modified by skepticalee

skepticalee — Sun, 09 Sep 2018 10:16:12 -0000

--- v21
+++ v22
@@ -273,6 +273,9 @@

 ####Blend mode that failed to produce anything reasonable in Imagick
 #####Subtract
+
+The `subtract` constant reulted in an unusable image, but `minussrc`worked as intended.
+
 PaperLT |Imagick|Imagick original
 ---------- | ----------| ----------
 ||