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There is a written interview as well. I'll upload the link when they get it on line, though I'm affraid it will be written in french. Ar. |
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leider in Deutschland nur mit einem Trick zu sehen. Gruß Manni |
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Scanning and Image Processing TechniqueQuote:
I'm hardly a graphics guru and certainly not the final word on the best way to go about scanning and generating full-size PDFs from magazine plans or scale planviews. I'm still very much in the learning stage on how to go about doing this, but I'll try to share the general approach I've been using. I'm not a Gimp user (yet), so I can't tell you specifically what tools or controls you would need to use in Gimp to accomplish the effect of differentially adjusting the image contrast. In Paint Shop Pro 5.01 (which is circa 1998), there is a highlight/midtone/shadow tool that can be used to independently skew the lighter tones towards white and the darker tones towards black. This function wouldn't be needed if the magazine pages being scanned were on pure white paper - but over time they yellow, or were never pure white to begin with. So when you do a grey scale scan, or convert a color scan to grey scale, you get a background that is grey toned. In Paint Shop Pro, there is also a brightness/contrast tool that can be used to increase/decrease the overall brightness and/or increase/decrease the overall contrast of an image. I tend to muck around with both the highlight/midtone/shadow tool and the brightness/contrast tool as I make incremental adjustments to the scanned image. My goal is to make adjustments that effectively "burn out" the grey tones of the background while maintaining dark lines in the drawing. This is relatively easy to do if the grey tones in the background are very light. The darker the grey tones in the background, the more difficult it is to remove them using this approach. The extreme application of this approach is to increase the image contrast to the point that the image color palette is reduced to only two values - black and white. Paint Shop Pro has a palette reduction tool that can be used to do this in a straightforward manner. I assume GIMP incorporates an analogous tool. Dithering the palette all the way down to black and white generally works well to clean the background and it also has the effect of decreasing the image file size to a minimum at a given resolution. However, dithering the palette all the way down to black and white produces jagged, pixelated lines. The higher the resolution (DPI) of the image, the less pronounced the pixelation effect, but the larger the file size. File size is generally not an issue for printing hard copies of the plan, but it is an issue for publishing and sharing files in a forum like R/C Groups. 3 MB is the limit for PDFs here. So there is a trade-off and balance to be struck here between the depth of palette and the resolution that can be employed while keeping the file size under 3 MB. For plans and drawings that I scan for my own use and not to publish, I scan at 600 dpi and retain a 256 color palette. The resultant files are way over 3 MB in size, but that's not an issue at the blueprint shop. For plans and drawings to be published here, I endeavor to dither the palette down to 16 colors while maintaining a resolution of 150 dpi. To my eye this approach produces a nicer looking end result than dithering the palette all the way down to 2 colors (black and white). But black and white is certainly serviceable in terms of producing a buildable plan, and the resulting pixelation can be mitigated by higher resolution (at the expense of file size). Depending on your scanner software, you may also be able to make contrast adjustments in the scanned image as it is acquired by the scanner and before it is imported into your graphics program. I have a Canon CanoScan LiDE 600 scanner, which is also a digital antique. But the scanning software that was bundled with it is actually fairly sophisticated in terms of being able to differentially adjust the brightness and contrast of the scanned image. In general I prefer to do untweeked scans and perform all the image tweeking in Paint Shop Pro post acquisition. But if you aren't finding the tools to accomplish the adjustments you want to make in Gimp, you might find them in your scanner software. There is clearly more than one way to skin the cat when it comes to doing this, and I think the particulars regarding the trade-off between palette and resolution come down to a matter of personal preferences as well as the amount of time available to do the digitizing. Bob Keller |
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Al, I've also been looking for sheet wood free flight model airplanes to use with the Cox.020 motor. Do you have any leads on plans for the Berkley Baby Yank or similar planes. Thank you, Bill Oswego,NY
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Icedriller;
Buttercup, by Fred Reese. Model Aviation June 1985 https://www.rcgroups.com/forums/show...=561552&pp=100 |
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Last edited by rick.benjamin; Nov 14, 2012 at 06:09 PM.
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That looks like a built up wing to me, Rick. Keep lookin' while I'm looking, too. g |
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Icedriller;
Humbug 020 slab plank https://www.rcgroups.com/forums/show...postcount=6427 Little Red Twin https://www.rcgroups.com/forums/show...4&postcount=87 |
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Last edited by rick.benjamin; Nov 14, 2012 at 07:00 PM.
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Icedriller,
Here's one you might like. The Ranger 30. I think its old enough for this thread? g |
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Okay Gimped and Photo Shopped. Not perfect but okay. If someone with better skills than mine can improve on it, then by all means be my guest. It can stand to be darkened a bit, but my neck's killing me right now! The scale might also be off a bit.
g |
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solid display model
Here's 1942...... a Brewster F2A-3
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Joe |
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