Jump to content
Shanheavel

BMP to PNG with transparent color

Recommended Posts

Shanheavel

I'd like to load a BMP file then change chosen color (0xFF00FF) to transparent and save it as PNG file. I'm using a code from other thread. I've modified it a little, but it still doesn't work.

My program displays image with transparent color correctly, however saves a black image file.

#include <Constants.au3>
#include <WinAPIEx.au3>
#include <WindowsConstants.au3>
#include <GUIConstantsEx.au3>
#include <ScreenCapture.au3>
#include <WinAPI.au3>


Global Const $STM_SETIMAGE = 0x0172
Global Const $STM_GETIMAGE = 0x0173

$hForm = GUICreate('MyGUI', 400, 400)
$Pic = GUICtrlCreatePic('', 50, 50, 144, 87)
$hPic = GUICtrlGetHandle(-1)

_GDIPlus_Startup()

$hDstDC = _WinAPI_CreateCompatibleDC(0)
$hBitmap = _WinAPI_CreateSolidBitmap(0, _WinAPI_GetSysColor($COLOR_3DFACE), 144, 87, 0)
$hDstSv = _WinAPI_SelectObject($hDstDC, $hBitmap)
$hSrcDC = _WinAPI_CreateCompatibleDC(0)
$hImg = _WinAPI_LoadImage(0, @ScriptDir & '\piclvq.bmp', $IMAGE_BITMAP, 0, 0, $LR_LOADFROMFILE)
$hSrcSv = _WinAPI_SelectObject($hSrcDC, $hImg)
_WinAPI_TransparentBlt($hDstDC, 0, 0, 144, 87, $hSrcDC, 0, 0, 144, 87, 0xFF00FF)


$hGraphic = _GDIPlus_GraphicsCreateFromHWND($hForm)
$hImage = _GDIPlus_BitmapCreateFromGraphics(144, 87, $hGraphic)

; Save resultant image
_GDIPlus_ImageSaveToFile($hImage, "My_transparent_image.png")

_WinAPI_SelectObject($hDstDC, $hDstSv)
_WinAPI_DeleteDC($hDstDC)
_WinAPI_SelectObject($hSrcDC, $hSrcSv)
_WinAPI_DeleteDC($hSrcDC)

_WinAPI_DeleteObject($hImg)
_WinAPI_DeleteObject(_SendMessage($hPic, $STM_SETIMAGE, $IMAGE_BITMAP, $hBitmap))
$hPic = _SendMessage($hPic, $STM_GETIMAGE)
If $hPic <> $hBitmap Then
    _WinAPI_DeleteObject($hBitmap)
EndIf

GUISetState()

Do
Until GUIGetMsg() = -3

piclvq.bmp

Edited by Shanheavel

Share this post


Link to post
Share on other sites
Shanheavel

Yeah, it works! You saved me a lot of time. I've just replaced screen capturing with making bitmap from a file.

Here is full working code:

#include <ScreenCapture.au3>

_GDIPlus_Startup()
Global $iWidth = 144, $iHeight = 87
Global $hBitmap_GDIPlus = _GDIPlus_BitmapCreateFromFile("piclvq.bmp")
Global $hBitmap_Result = _GDIPlus_BitmapCreateFromScan0($iWidth, $iHeight)
Global $hBitmap_Result_Ctxt = _GDIPlus_ImageGetGraphicsContext($hBitmap_Result)

Global $aRemapTable[2][2]
$aRemapTable[0][0] = 1
$aRemapTable[1][0] = 0xFFFF00FF ;Farbe, die Transparent gemacht werden soll

Global $hIA = _GDIPlus_ImageAttributesCreate()
_GDIPlus_ImageAttributesSetRemapTable($hIA, 1, True, $aRemapTable)
_GDIPlus_GraphicsDrawImageRectRect($hBitmap_Result_Ctxt, $hBitmap_GDIPlus, 0, 0, $iWidth, $iHeight, 0, 0, $iWidth, $iHeight, $hIA)
_GDIPlus_ImageSaveToFile($hBitmap_Result, @ScriptDir & "\Result.png")

_GDIPlus_GraphicsDispose($hBitmap_Result_Ctxt)
_GDIPlus_BitmapDispose($hBitmap_GDIPlus)
_GDIPlus_BitmapDispose($hBitmap_Result)
_GDIPlus_ImageAttributesDispose($hIA)
_GDIPlus_Shutdown()

ShellExecute(@ScriptDir & "\Result.png")

Func _GDIPlus_ImageAttributesSetRemapTable($hImageAttributes, $iColorAdjustType = 0, $fEnable = False, $aColorMap = 0)
    Local $iI, $iCount, $tColorMap, $aResult
    If IsArray($aColorMap) And UBound($aColorMap) > 1 Then
        $iCount = $aColorMap[0][0]
        $tColorMap = DllStructCreate("uint ColorMap[" & $iCount * 2 & "]")
        For $iI = 1 To $iCount
            $tColorMap.ColorMap((2 * $iI - 1)) = $aColorMap[$iI][0]
            $tColorMap.ColorMap((2 * $iI)) = $aColorMap[$iI][1]
        Next
        $aResult = DllCall($__g_hGDIPDll, "int", "GdipSetImageAttributesRemapTable", "handle", $hImageAttributes, "int", $iColorAdjustType, "int", $fEnable, "int", $iCount, "struct*", $tColorMap)
        If @error Then Return SetError(@error, @extended, False)
        If $aResult[0] Then Return SetError(10, $aResult[0], False)
        Return True
    EndIf
    Return SetError(11, 0, False)
EndFunc   ;==>_GDIPlus_ImageAttributesSetRemapTable

Danke! 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • c.haslam
      By c.haslam
      I had thought that _GDIPlus_ImageClone($hImage) removes all property items, but I now know that it copies property items.
      What is the easiest way of copying an image that has property items to another image that does not have property items?
    • aiter
      By aiter
      I am trying to get an image showing through a edit box.  I am only successful in making the edit box totally transparent
      #include-once #include <GUIConstants.au3> #include <GDIPlus.au3> #include <WinAPISys.au3> #include <colorconstants.au3> ;WS_EX_TRANSPARENT $gui = GUICreate("", 1000, 800, -1, -1, -1 , $WS_EX_LAYERED) ; use layered to get _winapi_setlay... to work $pic = GUICtrlCreatePic("c:\Program Files (x86)\AutoIt3\Examples\GUI\Merlin.gif", 0,0,1000, 800) GUICtrlSetState(-1, $GUI_DISABLE) $edit = GUICtrlCreateEdit("First line" & @CRLF, 176, 32,200,600) GUICtrlSetBkColor(-1,$COLOR_YELLOW) _WinAPI_SetLayeredWindowAttributes($gui,$COLOR_YELLOW,199) ; 199 is alpha (transparency level) GUISetState(@SW_SHOW,$gui) While 1 $msg = GuiGetMsg() Select Case $msg = $GUI_EVENT_CLOSE ExitLoop Case Else EndSelect WEnd Exit Func Terminate() exit(0) EndFunc So I am making the edit box's background yellow then using the _WINAPI_SetLayeredWIndowAttributes command to make the yellow disappear (which it does), but the alpha level is supposed to give a bit of opaqueness to it, but its not, just making it totally transparent.  The alpha level is in fact affecting the window itself and not the edit box. I only want the edit box to be partially transparent.
      Help appreciated.
       
    • ISI360
      By ISI360
      Hi!
      I am searching for a way to display a transparent image (or Icon) over an Button. And the image should always stay on top.

      Here is what i have so far:
      At script start the picture is over the button..but if you move the mouse over the button it overlaps the image.
      And if i add $GUI_ONTOP to the picture, the transparency is gone

      Maybe someone has an idea..

      Thanks in advance!
       
      #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> #include <GUIConstantsEx.au3> #include <StaticConstants.au3> #include <WinAPIIcons.au3> #include <WinAPIShellEx.au3> GUICreate("GUI", 300, 300) $hbutton = GUICtrlCreateButton("This is a button", 20, 40, 150, 30,$WS_CLIPSIBLINGS) $hpic = GUICtrlCreatePic("", 10, 10, 128, 128) _SetIconAlpha($hpic,"shell32.dll", 12,128,128) GUICtrlSetState(-1, $GUI_DISABLE) ;~ GUICtrlSetState(-1,$GUI_ONTOP) ;If you uncomment this..the picture is on top...but the transparency is gone :( GUISetState() While 1 $Msg = GUIGetMsg() If $Msg = $GUI_EVENT_CLOSE Then ExitLoop WEnd Func _SetIconAlpha($hWnd, $sIcon, $iIndex, $iWidth, $iHeight) If Not IsHWnd($hWnd) Then $hWnd = GUICtrlGetHandle($hWnd) If $hWnd = 0 Then Return SetError(1, 0, 0) EndIf EndIf If $iIndex <> 0 Then $iIndex = $iIndex - 1 Local $hIcon = _WinAPI_ShellExtractIcon($sIcon, $iIndex, $iWidth, $iHeight) If $hIcon = 0 Then Return SetError(1, 0, 0) EndIf Local $hBitmap, $hObj, $hDC, $hMem, $hSv $hDC = _WinAPI_GetDC($hWnd) $hMem = _WinAPI_CreateCompatibleDC($hDC) $hBitmap = _WinAPI_CreateCompatibleBitmap($hDC, $iWidth, $iHeight) $hSv = _WinAPI_SelectObject($hMem, $hBitmap) _WinAPI_DrawIconEx($hMem, 0, 0, $hIcon, $iWidth, $iHeight, 0, 0, 2) _WinAPI_ReleaseDC($hWnd, $hDC) _WinAPI_SelectObject($hMem, $hSv) _WinAPI_DeleteDC($hMem) _WinAPI_DestroyIcon($hIcon) _WinAPI_DeleteObject(_SendMessage($hWnd, 0x0172, 0, 0)) _SendMessage($hWnd, 0x0172, 0, $hBitmap) $hObj = _SendMessage($hWnd, 0x0173) If $hObj <> $hBitmap Then _WinAPI_DeleteObject($hBitmap) EndIf Return 1 EndFunc ;==>_SetIconAlpha  
    • c.haslam
      By c.haslam
      I think that _GDIPlus_ImageGetPropertyItem should return a Property Item that can readily be set as a property of another image. Why would one want to do this? A script might (as one of mine does) edit an image of a .jpg file then write the result to a .jpg file. In editing it, in my case, the number of horizontal and vertical pixels change, and the date/time edited should be set as a property. All other property items remain the same. Other GDI+ users may change other properties.
      So an approach is to copy all the property items from image1 to image2, then update a few properties.
      M$ provides a Property Item class (id, length, pointer to an array of values) but _GDIPlus_ImageGetPropertyItem returns something different.
      I think that, wherever reasonable, UDFs that are wrappers for M$ methods should work like M$'s methods. _GDIPlus_ImageGetPropertyItem does not do this:
      While M$ returns 2 values for a value that is a ratio of 2 numbers,  _GDIPlus_ImageGetPropertyItem returns numerator/denominator as a single value (often a Double). _GDIPlus_ImageSetPropertyItem (when included in GDIPlus.au3) will be unable to set ratio property items properly because it cannot know what the numerator and denominator are. So copying such property items will not work properly. M$ has a Void* buffer where the buffer is an array of values but _GDIPlus_ImageGetPropertyItem() returns the values in the same 1-d array as id, length and type. M$'s approach produces a 1-d array with the same number of elements for all property items while _GDIPlus_ImageGetPropertyItem produces a 1-d array with various numbers of elements. To me, this is not good programming practice. For a photo from a Sony camera, the worst case has 1-d array with 67 elements. When combined into a 2-d array with the property items of all properties, there are 66 rows and 67 columns, with many elements not used. So I suggest that _GDIPlus_ImageGetPropertyItem look like this:
      ; #FUNCTION# ==================================================================================================================== ; Name ..........: cGDIPlus_ImageGetPropertyItem ; Description ...: Gets a specified property item (piece of meta data) from an Image object ; Syntax ........: cGDIPlus_ImageGetPropertyItem($hImage, $iPropID) ; Parameters ....: $hImage - Pointer to an image object ; $iPropID - Identifier of the property item to be retrieved ; Return values .: Success: Array containing the values of the property item ; [0] - identifier ; [1] - size, in bytes, of the value array ; [2] - type of value(s) in the value array ; [3] - value array ; Failure: Sets the @error flag to non-zero, @extended may contain GPSTATUS error code ($GPID_ERR*). ; Author ........: Eukalyptus ; Modified ......: c.haslam ; Remarks .......: types: unsigned byte = 1, ASCII string = 2, unsigned short = 3, unsigned long = 4, ; unsinged rational = 5, undefined = 7, signed long = 9, signed rational = 10 ; Related .......: _GDIPlus_ImageGetPropertyIdList ; Link ..........: https://msdn.microsoft.com/en-us/library/windows/desktop/ms535390(v=vs.85).aspx, ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms534493(v=vs.85).aspx, ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms534414(v=vs.85).aspx ; Example .......: Yes ; =============================================================================================================================== Func cGDIPlus_ImageGetPropertyItem($hImage, $iPropID) Local $iSize = __GDIPlus_ImageGetPropertyItemSize($hImage, $iPropID) If @error Then Return SetError(@error, @extended, -1) Local $tBuffer = DllStructCreate("byte[" & $iSize & "];") Local $pBuffer = DllStructGetPtr($tBuffer) Local $aResult = DllCall($__g_hGDIPDll, "int", "GdipGetPropertyItem", "handle", $hImage, "uint", _ $iPropID, "uint", $iSize, "struct*", $tBuffer) If @error Then Return SetError(@error, @extended, -1) If $aResult[0] Then Return SetError(10, $aResult[0], False) Local $tPropertyItem = DllStructCreate("int id; int length; short type; ptr pvalue;", $pBuffer) Local $iBytes = DllStructGetData($tPropertyItem, "length") Local $pValue = DllStructGetData($tPropertyItem, "pvalue") Local $aRet[4] Local $type = DllStructGetData($tPropertyItem,'type') Local $tValues, $iValues Switch $type Case 2 ;ASCII String $iValues = 1 $tValues = DllStructCreate("char[" & $iBytes & "];", $pValue) Case 3 ;Array of UShort $iValues = Int($iBytes / 2) $tValues = DllStructCreate("ushort[" & $iValues & "];", $pValue) Case 4, 5 ;Array of UInt / Fraction $iValues = Int($iBytes / 4) $tValues = DllStructCreate("uint[" & $iValues & "];", $pValue) Case 9, 10 ;Array of Int / Fraction $iValues = Int($iBytes / 4) $tValues = DllStructCreate("int[" & $iValues & "];", $pValue) Case Else ;Array of Bytes $iValues = 1 $tValues = DllStructCreate("byte[" & $iBytes & "];", $pValue) EndSwitch $aRet[0] = DllStructGetData($tPropertyItem,'id') $aRet[1] = $iBytes $aRet[2] = $type Local $aVals[$iValues] If $type=2 Or $type=7 Then ; ASCII string or undefined $aVals[0] = DllStructGetData($tValues,1) Else For $i = 0 To $iValues-1 $aVals[$i] = DllStructGetData($tValues,1,$i+1) Next EndIf $aRet[3] = $aVals Return $aRet EndFunc And here is an example:
      #include <GDIPlus.au3> #include <Array.au3> Example() Func Example() _GDIPlus_Startup() Local $hImage = _GDIPlus_ImageLoadFromFile(RegRead((@AutoItX64 = True ? "HKLM\SOFTWARE\Wow6432Node\AutoIt v3\AutoIt" : "HKLM\SOFTWARE\AutoIt v3\AutoIt"), "InstallDir") & "\Examples\GUI\Torus.png") If @error Then _GDIPlus_Shutdown() MsgBox(16, "", "An error has occured - unable to load image!", 30) Return False EndIf Local $ar = _GDIPlus_ImageGetPropertyIdList($hImage) Local $vPropNbrs[UBound($ar,1)-1] ; Extract ID numbers For $i = 1 To UBound($ar,1)-1 $vPropNbrs[$i-1] = $ar[$i][0] Next ; Get all property items Local $aPropItems[UBound($vPropNbrs)][4],$vPropItem For $i = 0 To UBound($vPropNbrs)-1 $vPropItem = cGDIPlus_ImageGetPropertyItem($hImage,$vPropNbrs[$i]) For $j = 0 To 3 $aPropItems[$i][$j] = $vPropItem[$j] Next Next ; Collapse values arrays so _ArrayDisplay can display them Local $ar = $aPropItems For $i = 0 To UBound($aPropItems,1)-1 $ar[$i][0] = '0x'&Hex($ar[$i][0],4) $ar[$i][3] = '' For $j = 0 To UBound($aPropItems[$i][3])-1 $ar[$i][3] &= ($aPropItems[$i][3])[$j]&'|' Next $ar[$i][3] = StringTrimRight($ar[$i][3],1) Next _ArrayDisplay($ar) _GDIPlus_Shutdown() EndFunc Unfortunately this example (based on one now in the Help) does not exercise most of the item types, but I do not know of a file with EXIF metadata that is on most PCs. I have tested this code by updating and adding property items to torus.jpg and to a photo taken by a Sony camera. The code for implementing and calling _GDIPlus_ImageSetPropertyItem will be fairly simple [see below].
       
      Your thoughts?
       
    • c.haslam
      By c.haslam
      I have a strange symptom of a problem somewhere in my code, or in a UDF: when I add code to get all properties of a GDI+ image to a 6000-line script,  the variable type of a parameter is reported as a pointer when the caller clearly has this argument as a string. If I comment out my code that gets the properties, the function properly sees the parameter as a string.
      [Edit: The reporting as a pointer and getting image properties are miles apart, both in where they are in the script code and in where they are run.]
      At this point, I am looking for clues as to why this is happening, so the hunt is on!
      I have noticed one odd thing, in _GDIPlus_ImageGetPropertyIdList() I see a line that begins Local $sPropertyTagInfo = . This "line" is split into 2 lines. SCiTE shows that the first line is 2454 characters and the second 2400. Adding these numbers I get 4854 characters.
      But the Help for AutoIt3 Limits/defaults says that MAXLINESIZE, Maximum size for a line of script, is 4096 characters.
      The line would exceed the limit if AutoIt considers the subject line to be 1 line and not 2 lines.
      My question: is this line legal? Is buffer overun possible?
×

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.