feat(wallpapers): automate element spectrum download and panorama generation

Add script for downloading and processing element emission spectra
from Wikimedia Commons.

- Read element definitions from get_images.txt
- Retrieve original spectrum images from Wikimedia Commons
- Download element spectrum PNG files automatically
- Generate standardized filenames using atomic metadata
- Resize images to 3840px width
- Crop images to 3840x540 panorama format
- Export processed files to wallpaper collection directory
- Report missing spectrum images
- Automate creation of element-themed desktop wallpapers

image editing/download_visible_spektrum_image_from_wiki.sh

@@ -0,0 +1,102 @@
+#!/bin/bash
+
+###############################################################################
+# Script Name: get_element_spectra.sh
+#
+# Description:
+#   Downloads visible-light emission spectrum images for chemical elements
+#   from Wikimedia Commons and converts them into panorama wallpapers.
+#
+#   For each entry in get_images.txt, the script:
+#     1. Reads element information from the input file.
+#     2. Builds a standardized output filename.
+#     3. Locates the corresponding spectrum image on Wikimedia Commons.
+#     4. Downloads the original PNG file.
+#     5. Renames the image using element metadata.
+#     6. Resizes the image to 3840 pixels wide.
+#     7. Crops the image to 3840x540 pixels.
+#     8. Moves the finished panorama wallpaper to the destination folder.
+#
+# Input Format (get_images.txt):
+#   element_name atomic_number symbol
+#
+# Example:
+#   hydrogen 001 H
+#   helium   002 He
+#   lithium  003 Li
+#
+# Output Example:
+#   Elements_Panorama_001_H_Hydrogen.png
+#
+# Requirements:
+#   - Bash
+#   - wget
+#   - ImageMagick (convert)
+#   - Internet connection
+#
+# Usage:
+#   chmod +x get_element_spectra.sh
+#   ./get_element_spectra.sh
+#
+# Notes:
+#   - The script expects get_images.txt in the current directory.
+#   - Images are downloaded from Wikimedia Commons.
+#   - Missing images are reported and skipped.
+#
+###############################################################################
+
+while IFS= read -r line; do
+
+    # Build output filename:
+    # <atomic_number>_<symbol>_<Element>.png
+    element_name="$(
+        printf "%s_%s_%s%s\n" \
+            "$(echo "$line" | cut -f2 -d' ')" \
+            "$(echo "$line" | cut -f3 -d' ')" \
+            "$(echo "$line" | cut -f1 -d' ' | head -c 1 | tr 'a-z' 'A-Z')" \
+            "$(echo "$line" | cut -f1 -d' ' | tail -c +2)"
+    )"
+
+    # Build capitalized element name used by Wikimedia
+    element="$(
+        printf "%s%s\n" \
+            "$(echo "$line" | cut -f1 -d' ' | head -c 1 | tr 'a-z' 'A-Z')" \
+            "$(echo "$line" | cut -f1 -d' ' | tail -c +2)"
+    )"
+
+    # Retrieve original image URL from Wikimedia Commons
+    LINK="$(
+        wget -qO- "https://commons.wikimedia.org/wiki/File:${element}_spectrum_visible.png" \
+        | grep "Original file" \
+        | grep -o 'href="[^"]*' \
+        | tail -c +7
+    )"
+
+    if [ -z "$LINK" ]; then
+        echo "No spectrum image found for ${element}"
+        continue
+    else
+        echo "Downloading ${element}: ${LINK}"
+    fi
+
+    # Download original image
+    wget "$LINK"
+
+    # Rename downloaded image
+    mv "${element}_spectrum_visible.png" "${element_name}.png"
+
+    # Resize image to 3840 pixels wide
+    convert "${element_name}.png" \
+        -resize 3840x \
+        "${element_name}.png"
+
+    # Crop to panorama format
+    convert "${element_name}.png" \
+        -crop 3840x540+0+0 \
+        "${element_name}.png"
+
+    # Move final image to wallpaper directory
+    mv "${element_name}.png" \
+        "/home/lucas/Documents/Dokumente/Zeug/Wallpaper/Desktop1920x1080/Elements/Elements_Panorama_${element_name}.png"
+
+done < "get_images.txt"

quiethost/get_image.sh

@@ -1,16 +0,0 @@
-#!/bin/bash
-while IFS= read -r line; do 
-	element_name="$(printf "%s_%s_%s%s\n" "$(echo $line | cut -f2 -d' ')" "$(echo $line | cut -f3 -d' ')" "$(echo $line | cut -f1 -d' ' | head -c 1 | tr 'a-z' 'A-Z')" "$(echo $line | cut -f1 -d' ' | tail -c +2)")"
-	element="$(printf "%s%s\n" "$(echo $line | cut -f1 -d' ' | head -c 1 | tr 'a-z' 'A-Z')" "$(echo $line | cut -f1 -d' ' | tail -c +2)")"	
-	LINK="$(wget -qO- https://commons.wikimedia.org/wiki/File:${element}_spectrum_visible.png | grep "Original file" | grep -o 'href="[^"]*' | tail -c +7)"
-	if [ "$LINK" == "" ]; then 
-		echo "None for $element"
-	else
-		echo $LINK
-	fi
-	wget $LINK	
-	mv ${element}_spectrum_visible.png ${element_name}.png
-	convert ${element_name}.png -resize 3840x ${element_name}.png
-	convert ${element_name}.png -crop 3840x540+0+0 ${element_name}.png
-	mv ${element_name}.png /home/lucas/Documents/Dokumente/Zeug/Wallpaper/Desktop1920x1080/Elements/Elements_Panorama_${element_name}.png
-done < "get_images.txt"