Differences

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--- doc:appunti:software:color_management [2019/12/26 21:20] – [The ColorChecker Chart] niccolo
+++ doc:appunti:software:color_management [2020/01/02 16:31] – niccolo
@@ Line 39: / Line 39: @@
 To **convert** the stored **numerical values** back to **light intensity**, an **exponent** of **2.2** must be applied. Notice that a **linear color space** can be seen as a non-linear space where the exponent **gamma is 1.0**.
-So the **sRGG** (non linear) color space is widely used; that model is often called **perceptual gamma**. But if you work with high quality images (**16 bits per channel**) and if you want to **apply filters** that work on light and shadow, you should use a linear (RBG) workspace. The **GIMP 2.10** program internally uses linear channels data when higher than 8-bit per channel precision is used.
+So the **sRGB** (non linear) color space is widely used; that model is often called **perceptual gamma**. But if you work with high quality images (**16 bits per channel**) and if you want to **apply filters** that work on light and shadow, you should use a linear (RBG) workspace. The **GIMP 2.10** program internally uses linear channels data when higher than 8-bit per channel precision is used.
   * **[[https://www.kinematicsoup.com/news/2016/6/15/gamma-and-linear-space-what-they-are-how-they-differ|Gamma and Linear Space - What They Are and How They Differ]]**
@@ Line 82: / Line 82: @@
 ===== The GIMP =====
-The **GIMP** version **2.10** is required for **color management** and to handle images with **16 bit** per color channel.
+The **GIMP** version **2.10** is required for **color management** and to handle **TIFF images** with **16 bit** per color channel.
 {{.:color_management:color-picker-cielab.png?120 |GIMP Color Picker with CIE LAB values}}
 To view **CIE LAB** values in **Color Picker**: select the Color Picker tool, then keep the **shift key** pressed while clicking over the image.
-===== The ColorChecker Chart =====
+===== Other Interesting Pages =====
-The **[[wp>ColorChecker]]** is a [[wp>Color chart|color chart]] introduced in 1976 and manufactured by **Macbeth**, now **X-Rite**; it features **24 squared patches** of various colors. The colors were choosen quite arbitrarly: six **shades of gray**, some **primary colors**  (red, green, blue, cyan, magenta, and yellow) and other colors of natural objects, like skin tones, foliage, etc. There are **several manufacturers** that sell similar and **more or less compatible color charts**, the price and quality vary widely. Durability of the materials, uniformity and consistency of the colors and printing method are the distinctive features.
+  * **[[colorchecker_clones]]**
+  * **[[imagemagick_color_management]]**
-The most inexpensive color charts are obtained by **[[wp>Offset printing|offset printing]]**, the color patches are not made from solid colors, but obtained using **dithering** and **halftoning** of the primary printing colors.