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If you are using a rooted stock rom, you can replace the file "Boost_bootanimation.zip" with most other boot animations you can find out on the web. Just google "android boot animation", then you should find plenty.
Find a boot animation you like and download it to your sdcard, remount your system partition r/w , then either delete or rename the original file ( found in the folder /system/customize/resource ) and copy the new file over to the directory I just mentioned and rename it "Boost_bootanimation.zip". Execute "chmod 644 Boost_bootanimation.zip" (sets read and write permissions for user and read permissions for group and other ) and "chown root:root Boost_bootanimation.zip" (sets owner and group to root [if you have used a root shell, you can skip the chown'ing] ) on the file. Reboot into recovery and clear cache and dalvik cache, just to be safe and you will have a new custom "boot animation" or "splash screen" as you called it.
And I would recommend using a boot animation size 960x540 (pixel) or smaller, since this is the maximum screen size.
He is not refering to the bootanimation but the splash screen. Two different things. And the splash can not be modified through the firmware but needs to be flashed or dd write in order to change it.
Here is the thread for the splash utility the link is backup
[How-To] Custom Splash Screens [7/11/12]
If you need the stock image (for example you flashed IcedSpeed ROM and are needing to return to stock PM me and I will see.if Grad still has the stock one)
That would be one way (to create one), but you can also just replace "hTC_bootanimation.zip" ["HTC quielty brilliant" screen] . That is the very first screen that is displayed. No need to dd or anything.....
Why don't we just wait and see what the guy actually wants to replace.

Does anyone have a splash screen already to zip with cwm.I went to the site you posted and then to the CDA site seen the dark HTC screen but can't flash.
Did you download the zip utility? Did you use the utility to convert your image to a .img and tried using the script? I assume you are in windows. More than glad to help you but exactly what image are you wanting to use, and is it in the right resolution? (The link has all the instructions) Eitherway give me a detail of where exactly you are having problems at and I will gladly help you out. I have an image you can flash in a flashable zip but not sure you want to sport my avatar and screen name on your phone, or the other one which is 2fasts Pontiac phoenix as your splash....lol
Sent from my SCH-R530U using Tapatalk 2
He is not refering to the bootanimation but the splash screen. Two different things. And the splash can not be modified through the firmware but needs to be flashed or dd write in order to change it.
Here is the thread for the splash utility the link is backup
2fastroms.com: The Leading Fast ROM Site on the Net
If you need the stock image (for example you flashed IcedSpeed ROM and are needing to return to stock PM me and I will see.if Grad still has the stock one)