Diferències

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Enllaç a la visualització de la comparació

--- info:cursos:pue:python-pcpp1:m3:1.4 [23/12/2023 20:01] – creat mate
+++ info:cursos:pue:python-pcpp1:m3:1.4 [23/12/2023 20:05] (actual) – mate
@@ Línia 79: / Línia 79: @@
 {{ :info:cursos:pue:python-pcpp1:m3:pasted:20231223-110114.png }}
-Setting non-zero values for more than one component produces intermediate colors, e.g. red and blue set to 255 with green set to 0 gives the violet.
+Setting non-zero values for more than one component produces **intermediate colors**, e.g. red and blue set to 255 with green set to 0 gives the **violet**.
 {{ :info:cursos:pue:python-pcpp1:m3:pasted:20231223-110141.png }}
+It seems clear, doesn't it?
+OK, but how to specify all these (more than 16 million) mixes in a comprehensive way?
+It's is done by a trick used extensively in web pages – as a **string** starting with a **hash** (#) followed by **6 hexadecimal** digits. Each p**air of the digits** forms the value from range **0x00..0xFF** (0..255) what determines the specific component level.
+This is how it works:
+{{ :info:cursos:pue:python-pcpp1:m3:pasted:20231223-110314.png }}
+All three pairs (RR, GG and GG) are **two-digit hexadecimal number** so:
+  * #000000 is **black**
+  * #FFFFFF is **white**
+  * #FF0000 is **red**
+  * #00FF00 is **green**
+  * #0000FF is **blue**
+  * #00FFFF is **turquoise**
+  * #FF00FF is **violet**
+  * ...
+Please, forgive us that we made that list so short. To tell the truth, we have no idea how to name each of these 16 million colors – do you?
+Note: when all the components are set to the **same value**, equal neither to zero nor to 0xFF (e.g. #0F0F0F0), you will get **254 shades of gray**.
+Look at the code in the editor. We want to show you a little test showing how the RGB works:
+<code python>
+import tkinter as tk
+window = tk.Tk()
+button = tk.Button(window, text="Button #1",
+                   bg="#9370DB",
+                   fg="#FFA07A",
+                   activeforeground="#FFF0F5",
+                   activebackground="#FF69B4")
+button.pack()
+window.mainloop()
+</code>
+Do the colors look the same as in the previous code?
+They should look the same as we used RGB equivalents of the previously used ''tkinter'' color names.
+Now try to find RGB codes for all your favorite colors. There are so many choices – don't feel lost!