Preparation of pictures of
ceramic beer bottle caps

Instead of a digital camera I use a computer scanner for the preparation of pictures. A scanner has the advantages that the printed surface of the ceramic caps always is in the focus of the scanner and there are less reflections on the surface of the ceramic caps. Furthermore the caramic caps easily can be placed in large numbers onto the glass plate of the scanner. Taking pictures with a digital camera requires to place the ceramic caps either in some kind of support or to put them carefully by hand on a flat surface, standing at the small back tip of the ceramic caps.

If you do not have access to a scanner you can use a normal copy machine in a copy shop to generate pictures of your ceramic caps. In this case please place transparent cling film onto the glass plate ot the copy machine, avoiding any air bubbles between the foil and the glass. Than place the ceramic caps with their printed side facing to the glass plate onto the glass plate and start a copy which is just scanned but not printed. However you should ask the personel of the copy shop, if they agree you to use their copy machine this way. The cling film should avoid any scratches to the glass plate of the copy machine.

Below you see a few pictures, displaying how I prepare pictures of ceramic caps using a computer scanner:

Perparing pictures of ceramic caps by using a computer scanner

The ceramic caps are placed onto the glass plate of the scanner with the printed side of the ceramic caps facing to the glass plate. I usuallly position all ceramic caps exactly onto the glass plate. This way later on I do not have to individually rotate the pictures to have the wirting on the ceramic caps easily readable. Adjusting the ceramic caps can be done with a wooden tooth pick or something similar. Using a such a tool avoinds scratches on the glass plate of the scanner.


During scanning of the ceramic caps the ceramic caps are covered by a cardbord box

The ceramic bottle caps are covered with a cardbord box. This way the background of the scanned picture gets black and the colors of the ceramic caps, as well as their shape is well preserved on the scanned image.

Changing the background color of the scanned ceramci caps

After scanning I modify the scanned image as follows: I selects the background of the image and adjust the brightness to minimum and the contrast to maximum. This the picture gets a homogeneous black background. The background color easily can be changed for example to white, by selection of the background with the selection tool of a graphic program and by replacing it with another color.

Final images of the scanned ceramic brewry beer bottle caps

In order to get pictures of individual ceramic caps I open an empty picture file of the disired final size of a picture of a single ceramic cap, select a single ceramic cap from the scanned picture using the copy tool of the graphic program and paste this piece of the sanned picture into the empty picture file. Next the ceramic bottle cap is exactly centered within the picture and the picture is saved. Using this method it is even possible to get good quality picture of British ebonite screw caps, which have a dark grey color without any prints but only with embossed writing and logos on top of them. An example is shown at the right hand side in the figure above.

Original data files of pictures in general I store in the png-format, as png-files can ge stored lossless, whereas for example jpg-files are compressed and suffer quality loss with each saving step. So if I later on manipulate png-files by, for example inserting a logo etc. the quality of the picture does not deteriorate with each saving step between different manipulation steps.


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