Revamped and corrected the page

Create-a-custom-splash-screen.md

@@ -1,33 +1,54 @@
+# Introduction
 Are you bored of the standard power on screen?  
-Do you want your own image at power up to personalise your device?  
+Do you want your own image at power up to personalize your device?  
 You can!  
 
-Save a **240x304 24-bit BMP file** named `splash.bmp` in the root of the SD card. Beginning in firmware version 1.7.4, the splash screen BMP files stored on the SD card can be viewed in the File Manager application and set to be the current splash screen with a single click.  
+Save a **240x304 24-bit BMP file** named `splash.bmp` in the root of the SD card, and it will be used as a starting up splash screen !
+
+Beginning in firmware version 1.7.4, the splash screen BMP files stored on the SD card can be viewed in the File Manager application and set to be the current splash screen with a single click.  
 
 You can share and get ready to use images in the `#splash-screens` channel over our [Discord](https://discord.gg/tuwVMv3) group.
 
-## Example
-Some picture editor providing an exporter which can be configured. But to convert an existing picture, you could use [ImageMagick](imagemagick.org), which is a powerful image manipulation tool. It is open source and available for all common operating systems.  
+There is also https://ppsplash.creativo.hu/ where you can choose and download splash screens from a curated selection
 
-To just scale the picture down, use:
+You can of course use https://hackrf.app/ to upload them directly to SPLASH directory (firmware version >= 2.0.1 is needed)
+
+:warning: If your firmware is recent enough, it may support activation/deactivation of the splash screen via a checkbox in Settings/User Interface/Splash Screen. Don't forget to check it if the splash screen isn't displayed at startup ! :warning:
+
+## Example
+![image](https://github.com/user-attachments/assets/ecdf315a-9e1d-4707-bb0d-a3ed728efc4e)
+
+## Tools / How-to
+Use your favorite picture editor to adjust size, or use "convert" from [ImageMagick](imagemagick.org), which is a powerful image manipulation tool. It is open source and available for all common operating systems.  
+
+### To just scale the picture down, use:
 ```
 $ convert source.jpg -resize 240x304 destination.bmp
 ```
 
-If you see and don't want a frame left and right, you can adjust the convert with:
+### If you see and don't want a frame left and right, you can adjust the convert with:
 ```
 $ convert source.jpg -resize 240x304 -gravity center -extent 240x304 destination.bmp
 ```
 
-To check if the splash got the required parameter, check:
+### To choose the filling color when resizing/extending the image, add '-background color' after 'source.jpg':
+```
+$ convert source.jpg -background "#000000" -resize 240x304 -gravity center -extent 240x304 destination.bmp
+```
+or 
+```
+$ convert source.jpg -background black -resize 240x304 -gravity center -extent 240x304 destination.bmp
+```
+The list of predefined colors can be obtained with ```convert -list color```
+
+### To check if the splash got the required parameter, check:
 ```
 $ identify destination.bmp     
 destination.bmp BMP3 240x300 240x304+0+0 8-bit sRGB 216054B 0.000u 0:00.000
 ```
+If it is saying '8-bit', you're good. It's the number of bits by color components. For sRGB, 8+8+8 = 24-bit
 
-It says '8-bit', but is is for RGB -> 8+8+8 = 24-bit
-
-
-## Issues
-- If the custom splash is not shown in Fileman, try the size **240x300** instead of 240x304.
-- If you don't see a (custom) splash screen, make sure the feature is enabled in `Options -> Interface -> Show Splash`.
+## Limitations
+- image have to be a 24 bits bitmap
+- width have to be exactly 240 pixels wide
+- height have to be in the [ 1 , 304 ] range. Any additional lines will be cut