Incorrect colours from PlayEnhMetaFile?

Question

Over at https://github.com/python-pillow/Pillow/issues/8271, a user has posted a zip containing an EMF file - https://github.com/user-attachments/files/16448240/PillowIssue8271.zip

The user maintains that the white in this EMF file should be (255, 255, 255).

Running the following code, I find it to be (248, 248, 248).

HDC dc = CreateCompatibleDC(NULL);

BITMAPINFO info;
memset(&info, 0, sizeof(BITMAPINFO));
info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
info.bmiHeader.biWidth = 857;
info.bmiHeader.biHeight = 687;
info.bmiHeader.biPlanes = 1;
info.bmiHeader.biBitCount = 24;
info.bmiHeader.biCompression = BI_RGB;

void *ptr;
bitmap = CreateDIBSection(dc, &info, DIB_RGB_COLORS, &ptr, NULL, 0);
SelectObject(dc, bitmap);

HENHMETAFILE hemf = GetEnhMetaFile("test.emf");

RECT rect;
rect.left = 0;
rect.top = 0;
rect.right = 857;
rect.bottom = 687;
PlayEnhMetaFile(dc, hemf, &rect);

COLORREF color = GetPixel(dc, 200, 200);
printf("rgb %d %d %d\n", GetRValue(color), GetGValue(color), GetBValue(color));

The use of PlayEnhMetaFile seems straightforward. Is anyone able to tell me if I've missed something, or if I'm correct and the colour really is (248, 248, 248).

Thanks for your time, let me know if there is a better place to have asked this question.

Answer 1

The file can be investigated with a free vector graphics editor, which shows that it consists of a black border, having transparent background, and a centred smaller embedded image,. The background colour of the image is (248, 248, 248).

Other programs that displays this kind of images, such as Paint and Word, seem to alter the pixels.