unfortunatly i dont know Crystal report.
for creating image from a blob field, VFP9 uses the pictureVAl property introduced in vfp9(with gdiplus)
there is 2 ways to show an image in a control image on a form:

1.general method

local xpict
m.xPict = FILETOSTR(getpict())  &&can be stored in a blob field in table for ex.
thisForm.Image1.PictureVal =m.xPict

2.if the picture extension is BMP,ICO,metafile WMF or even JPG can use also

loca xpict
m.xPict = loadPicture(getpict())
thisForm.Image1.PictureVal =m.xPict

googling you can see this interesting link (see chapter;Blobs and similar fields)
http://www.hexcentral.com/articles/crystal-images.htm

can google this string 'display blob image in crystal report' there is many sources.