HOL, CAPS and many other sites have their own rules for the submission of scanned images. If you wish to use those images, please ensure they meet the afore mentioned criteria. If they exceed it you can convert it using your favourite paint program or submit it to me for conversion. Please do not submit any images that fall short of this criteria.
It would be preferable to ask for permission rather than just assuming that because a scan matches your criteria you can use it. I know CAPS have stated in the past that any scans in their project can be freely used in others but not every project will have the same rules.