Pixelwizard
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Joined: Sep 10, 2012
Post Count: 31
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Re: Background Image wrong Scaling
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there is (for some reason) a difference. but it seems, there is a way to minimize it. the bulding has a lot of colums, surrounding a square. so any x and y coordinate is well known. in ps i can create a ruler with my own scale. if i measure in ps, i find for any distance i measured the same value, corresponding to the calculated x/y coordinates. what i did was to refine the scaling during import of the background image. they more precise the start- and endpoints are set, they more precise the background fits to the plan. accepting the plan inside has tolerances, i just keep my eyes to the four important outer edges. i minimized the difference from approx. 45 cm in y to 10 cm in y now. i still guess, this is a effect calculating a jpg from 25 cm to 41 meters... i have a "little ,)" experience with calculating pixels and resolutions, so i keep it in mind and will do some tests with higher resolution of the basic plan to find the key which values will give the best possible result. it's like some effects in prepress - just think of the effects of posterisizing if you push a small, low resolution icon to a lot bigger size. you will loose the precision in any way. helpful could be to know, which "resolution" is used in the program to draw all the lines. then it's possible to calculate backwards, to get the correct resolution for a bitmap (jpg is a bitmap) in the beginning to fit to the final resolution after scaling up. sounds complicated, but this calculation is used since years in prepress when you scan lineart. they more you have to scale it up at the end to a target resolution, they more scan-resolution you need in the beginning to compensate "unsharpness".
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WIN10 Pro 64bit * 16 GB RAM * AMD FX 6100 * Geforce GTX 660
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[Feb 28, 2017, 4:06:35 PM]
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