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Originally Posted by Pblais IJust for the record you can't correct maps in PhotoShop, but you can think you can. A scanned map is a one off and less accurate. There are things you can't fix. It's does not mean it won't work. Magellan sailed with some pretty worthless maps. It's all how you deal with it. Information is always inaccurate in some way. You just learn to deal with it. |
Curious! Why is it people keep saying what I do can't be done?
Here's the procedure:
I use a Nikon D50 with an 18-50 f2.8 Sigma lens. Charts are taped flat to the floor, and the camera is mounted on a tripod, carefullyadjusted to ba as parallel to the floor as possible. Settings are identical each time so I don't need to experiment. The file is saved and manipulated as a raw file, so all of the detail is retained as long as possible.
Any deviation from non-parallel is easily corrected in Photoshop with the perspective crop tool and using ruled paper I know exactly the amount of barrel distortion to remove with the lens correction filter.
SeaClear comes with a import tool that allows me to put reference points on the in as many places as I need (minimum of three).
I have done this with local charts that I have official scanned copies of, and the resolution is obviously not quite as crisp, but it is totally readable, and I have not found the homemade version to be off register in longitude and latitude far enough to measure. I can do a section of paper chart up to about 16x20 in one go.
So why can't I correct the maps in Photoshop? Or are we talking with different definitions of what we mean when we say "correct"?