Scanntronik's Handyscanner produces picture data to be recieved by the C64 in a format of 528x640 pixels. There's an option to scale the data to 300% enlargement when reading in. In fact, this setting reads the data 1:1, without absorbing any digitized values. All other settings of the original Scanntronik software (downto an enlargement of only 30%) lead to linearly abandoning part of the received data that won't be stored and thus can't be taken to display the picture (see also ldr.PFoxResample). Low scaled scans taken with the original software often look rather coarse and disappointing.

GoDot only works in full resolution (which adequates to Scanntronik's 300% setting). However, the data now to acquire won't fit into the 4Bit memory area. What is more, the image would be stored in portrait format, rotated by 90 degrees. These are the reasons why the loader processes the device's data right in the course of scanning. They will be cropped to 400x640 pixels (thus refusing the left third of the scan motif in the device's display window), and thereafter be piled anew and resampled to the typical 320x200 GoDot pixels (ldr.PFoxResample). Thus producing benefits and drawbacks.

First one disadvantage: the fixed scaling of 1:1 delimits the scan area to motifs of only 80x50 mm (5x3 in). Bigger motifs have to be acquired by the original software. And now the advantage: resampling leads to an anti-aliasing effect where sharp blendings, corners and so on will be "softened". Thereafter however, the image in memory will be a true gray scale image that can be optimized with GoDot's balancing settings. GoDot scans are well qualified to be displayed in multicolor. Nevertheless, all information for an optimal hires display is at hand (see Dithering, Preparing for Printout).

Best scans will be provided when the hardware dithering facility of the scanner is switched off (slider "Dither" set to "B/W") and when the motif is considered dark (slider "Bright" between "H" and "T" of the caption). The contrast adjustment slider remains in a central position. Only lineart drawings should be acquired with full hardware dithering activated (slider "Dither" set far right), thus producing more shades of gray for the anti-aliasing.

Other than the original software, GoDot scans from left to right - you are always presented with landscape pictures. If you scanned a portrait image (lying on side within GoDot) and want to print it out, you should before shrink it to a width of 36 (using mod.ClipWorks, function Shrink), because the pixel aspect ratio of printers is once again different. You should process a scan the same way if you want to export it to Pagefox format or to a format of other than C64 computers.

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Arndt Dettke

Copyright © 1998, A. Dettke, Last Updated - 1/24/98