![]() ![]() The graduations on the scanned image of the transparent ruler will be sharp within the scanner’s DOF. You can determine DOF by scanning a transparent ruler that has been placed on an incline, with one end well below the minimum DOF height and the other end placed well above the maximum DOF height. Like any lens, your scanner’s lens has a range of acceptable focus, or depth of field (DOF) where it performs best. I’ll be using the Epson V700/V800 for this instruction, but the procedures should work for any flatbed scanner. To verify the focusing capability of your flatbed scanner, all you’ll need is a transparent ruler and a second ruler to measure with. Then, you can take steps to make sure your negative carrier places negatives precisely at the optimum distance above the scanner platen for maximum sharpness and resolution. ![]() ![]() In this short article, I’ll show you an easy way to verify the depth of field on your flatbed scanner’s lens. If you are getting consistently blurry scans or scans that you believe should be sharp and aren’t, you may have a scanner that isn’t focusing precisely, or a holder that isn’t placing the negative where the lens is focusing. Most of the time, this works well.īut there are times when you might suspect that the fixed focus (or even auto focus) isn’t behaving right. Many flatbed scanners have a fixed focal distance set by the manufacturer, and they provide holders that place the negative “precisely” at that distance. Now, let’s talk about checking the focus of your scanner. Neither are good situations to find yourself in. And that may be causing you to pull your hair out. If your film holders don’t place the film where the scanner focuses its lens, then you’re going to get fuzzy images. ![]() Grayscale scans fall in the middle.This article describes a way to make sure the placement of negatives above your scanner’s platen is within the depth of field of your scanner’s lens for best sharpness. Color: All of the color and shading information is preserved.Īll other things being equal, black and white scans will have the smallest file sizes, and color scans will have the largest file sizes.If you have dark green on your document, it’ll be changed to dark gray. If you have light blue on the page, it’ll be changed to light gray. Grayscale: All color information is removed, but shading information is kept.Black and White: All color and shading information is removed - any colors or greys are converted to black.Here’s what those terms mean practically. There are three basic color format options you can choose from when scanning: color, grayscale, and black and white. RELATED: The Best External Hard Drives of 2023 Color That isn’t a big deal if you’re just archiving a lot of documents, since storage is cheaper than ever before, but it might matter if you’re uploading them to the internet. Normally-sized text will be as legible at 200 DPI as it is as 1200, and at a small fraction of the file size - The 200 DPI scan had a size of 57.5 kilobytes, the 1200 DPI scan had a size of 1.6 megabytes. They were scaled to be about 650 pixels wide. The top text is a 1200 DPI scan of 11 pt font, the bottom is a 200 dpi scan of the same font. ![]()
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