Chance

I've been looking at some C++ function that did this by saving an image to a stream and doing it in memory, lead me to a post by the one and only UEZ, modified the function I found and surprisingly enough, it's exactly what I needed.

Func _GDIPlus_SaveImageToStream($hBitmap, $iQuality = 50, $Encoder = "jpg") ;coded by Andreik, modified by UEZ, FS Local $tParams Local $tData Local $pData Local $pParams Local $sImgCLSID = _GDIPlus_EncodersGetCLSID($Encoder) Local $tGUID = _WinAPI_GUIDFromString($sImgCLSID) Local $pEncoder = DllStructGetPtr($tGUID) If $Encoder == "jpg" Or $Encoder == "jpeg" Then $tParams = _GDIPlus_ParamInit(1) $tData = DllStructCreate("int Quality") DllStructSetData($tData, "Quality", $iQuality) ;quality 0-100 $pData = DllStructGetPtr($tData) _GDIPlus_ParamAdd($tParams, $GDIP_EPGQUALITY, 1, $GDIP_EPTLONG, $pData) $pParams = DllStructGetPtr($tParams) Else $pParams = 0 EndIf Local $hStream = DllCall("ole32.dll", "uint", "CreateStreamOnHGlobal", "ptr", 0, "bool", True, "ptr*", 0) If @error Then Return SetError(1, 0, 0) $hStream = $hStream[3] DllCall($ghGDIPDll, "uint", "GdipSaveImageToStream", "ptr", $hBitmap, "ptr", $hStream, "ptr", $pEncoder, "ptr", $pParams) _GDIPlus_BitmapDispose($hBitmap) Local $hMemory = DllCall("ole32.dll", "uint", "GetHGlobalFromStream", "ptr", $hStream, "ptr*", 0) If @error Then Return SetError(2, 0, 0) $hMemory = $hMemory[2] Local $iMemSize = _MemGlobalSize($hMemory) Local $pMem = _MemGlobalLock($hMemory) $tData = DllStructCreate("byte[" & $iMemSize & "]", $pMem) Local $bData = DllStructGetData($tData, 1) Local $tVARIANT = DllStructCreate("word vt;word r1;word r2;word r3;ptr data;ptr") DllCall("oleaut32.dll", "long", "DispCallFunc", "ptr", $hStream, "dword", 8 + 8 * @AutoItX64, "dword", 4, "dword", 23, "dword", 0, "ptr", 0, "ptr", 0, "ptr", DllStructGetPtr($tVARIANT)) ;http://msdn.microsoft.com/en-us/library/windows/desktop/ms221473(v=vs.85).aspx _MemGlobalFree($hMemory) Return $bData EndFunc ;==>_GDIPlus_SaveImageToStream
P.S. Thanks for the "help".