Codestation has once again just updated his latest project, PRXshot, a plugin that lets you take in-game screenshots. Note:unlike similar applications, you don't need to pause the game to take captures.
Installation:
Add the following line to game.txt and vsh.txt
Use: Take a screenshot with the note key.ms0:/seplugins/prxshot/prxshot.prx 1 (Enable)
Changelog:
v0.4.0
[+]Implemented key timeout, so now you can add some delay to the screenshot
button so doesn't interfere with the normal game operation.
[!]Internal change: rewrote the plugin in C++
[!]Fixed the known issue of taking a screenshot while the aLoader is
launching an ISO (only for the C++ branch)
v0.3.0:
[+]Added the option to set your custom screenshot key per game.
[!]Major rewrite to the hook core (removed the asm payload code), so it avoids
the crashes in 6.20 TN + loaders (i hate those loaders, really >_<).
[!]Moved the comments of the prxshot.ini to the readme for more readibility.
v0.2.4:
[!]Fixed the bug introduced in 0.2.3 that didn't detect the settings
in the .ini file.
[!]Fixed bug with homebrew not properly detected in PSPGo using the
internal storage.
v0.2.3:
[+]Added support for eLoader (1.50 eboot loader)
[+]Recreate the XMB folder if is deleted.
[!]Fixed nasty bug that causes a crash when taking very early screenshots
(Note that you can't take screenshots on loaders because the game isn't
loaded yet, a special folder is gonna be added for this in the future)
[+]Added option XMBClearCache to the prxshot.ini. While this updates the picture
directory when taking screenshots in the XMB i recommend that is better
to leave it disabled because it causes troubles with game categories.
[+]Added more debug messages.
v0.2.2:
Added support for POPS (PSone games support).
Added support for storing the screenshots into the M2 in the PSPGo.
Added logging and made it conditional on build when compiling from source.
Fixed bug with XMB icon creation introduced in 0.2.0.
v0.2.1:
Added OIL to blacklist.
v0.2.0:
Removed trailing "/" so the directory creation don't fail.
New configuration file (prxshot.ini) so now you can configure some things
like background use for picture folders, change the button combo to take
the screenshot and the suffix/prefix of the picture file.
v0.1.3:
Create /PSP/SCREENSHOT in case it doesn't exists
v0.1.2:
Rewrote asm payload code (doesn't need memory allocation anymore so hopefully the issues with 6.20 / aLoader are finally fixed)
v0.1.1:
Fixes bugs with 6.20 TN and/or aLoader
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[+]Implemented key timeout, so now you can add some delay to the screenshot
button so doesn't interfere with the normal game operation.
[!]Internal change: rewrote the plugin in C++
[!]Fixed the known issue of taking a screenshot while the aLoader is
launching an ISO (only for the C++ branch)
v0.3.0:
[+]Added the option to set your custom screenshot key per game.
[!]Major rewrite to the hook core (removed the asm payload code), so it avoids
the crashes in 6.20 TN + loaders (i hate those loaders, really >_<).
[!]Moved the comments of the prxshot.ini to the readme for more readibility.
v0.2.4:
[!]Fixed the bug introduced in 0.2.3 that didn't detect the settings
in the .ini file.
[!]Fixed bug with homebrew not properly detected in PSPGo using the
internal storage.
v0.2.3:
[+]Added support for eLoader (1.50 eboot loader)
[+]Recreate the XMB folder if is deleted.
[!]Fixed nasty bug that causes a crash when taking very early screenshots
(Note that you can't take screenshots on loaders because the game isn't
loaded yet, a special folder is gonna be added for this in the future)
[+]Added option XMBClearCache to the prxshot.ini. While this updates the picture
directory when taking screenshots in the XMB i recommend that is better
to leave it disabled because it causes troubles with game categories.
[+]Added more debug messages.
v0.2.2:
Added support for POPS (PSone games support).
Added support for storing the screenshots into the M2 in the PSPGo.
Added logging and made it conditional on build when compiling from source.
Fixed bug with XMB icon creation introduced in 0.2.0.
v0.2.1:
Added OIL to blacklist.
v0.2.0:
Removed trailing "/" so the directory creation don't fail.
New configuration file (prxshot.ini) so now you can configure some things
like background use for picture folders, change the button combo to take
the screenshot and the suffix/prefix of the picture file.
v0.1.3:
Create /PSP/SCREENSHOT in case it doesn't exists
v0.1.2:
Rewrote asm payload code (doesn't need memory allocation anymore so hopefully the issues with 6.20 / aLoader are finally fixed)
v0.1.1:
Fixes bugs with 6.20 TN and/or aLoader
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you can also "quote"... little noob 
no thanks!!!
that doesn't change anything about my problem 
Everything for PSP