How can I dispaly alpha Channels to proxy and show transparency correctly?

Hi all! I have a problem. Please help me. Thank you very much.
I want to display alpha Channels to proxy and show transparency correctly. I have get the datas of alpha Channels and RGB color. Following are the codes:
void HiddenData::PaintPreview()
if( !channelData ) return;
PSPixelMap pixels;
int spotChannelCount = gFilterRecord->documentInfo->alphaChannelCount;
pixels.version       = ( spotChannelCount > 0 ) ? 2 : 1;
pixels.bounds.left   = proxyRect.left;
pixels.bounds.right = proxyRect.right;
pixels.bounds.top    = proxyRect.top;
pixels.bounds.bottom = proxyRect.bottom;
int32 proxyWidth = proxyRect.right - proxyRect.left;
int32 proxyHeight = proxyRect.bottom - proxyRect.top;
pixels.imageMode     = gFilterRecord->documentInfo->imageMode;
pixels.rowBytes      = proxyWidth * gFilterRecord->documentInfo->depth / 8;
pixels.colBytes   = 1;
pixels.planeBytes    = proxyWidth * proxyHeight;
pixels.baseAddr   = channelData;
// new for version 2 of PSPixelMap
PSPixelOverlay* overlay = NULL;
if( spotChannelCount > 0 ){
overlay = new PSPixelOverlay[ spotChannelCount ];
if( overlay ){
   int j = 0;
   for( int i = 0; i < spotChannelCount; i++ ){
    overlay[i].data = channelData + pixels.planeBytes * (4 + i);
    overlay[i].rowBytes = pixels.rowBytes;
    overlay[i].colBytes = 1;
    overlay[i].r = (unsigned8)spotColorList[j++];
    overlay[i].g = (unsigned8)spotColorList[j++];
    overlay[i].b = (unsigned8)spotColorList[j++];
    overlay[i].opacity = 50 * 2.55;
    overlay[i].overlayAlgorithm = kStandardAlphaOverlay;
    overlay[i].next = ( i == (spotChannelCount - 1)) ? NULL : overlay + i + 1;
   pixels.pixelOverlays = overlay;
   pixels.colorManagementOptions = kViewAsStandardRGB/*kViewAsMask*/;
pixels.mat = NULL;
pixels.masks = NULL;
pixels.maskPhaseRow = 0;
pixels.maskPhaseCol = 0;
(gFilterRecord->displayPixels)(&pixels, &pixels.bounds, 0, 0, (void *)hdc);
delete[] overlay;
But there is a problem.The image of alpha Channels in proxy is not clear, because overlay[i].opacity = 50 * 2.55.
It looks like diffrent from displaying in photoshop.I do not know how to use pixels.mat and pixels.masks.
Thanks!

I run the plugin. But It can not show alpha channels. Can you show the code in your example clearly.Thanks! Following are the frames.
The original document:
The result:
Can not show the alpha channels.

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