to determine the resolution should not consist of high contrast edges. There’s a fair amount of aliasing towards the center, but that should all be a blur in actual use. This method is based on a Sinusoidal Siemens Star which is evaluated on a radius. Gray Gamma 2.2 is as good as anything.Īnd here’s a really big file (12000×12000 pixels, 200 spokes), for those making a really big target. Since every pixel in the files is either pure black or pure white, it doesn’t matter what grayscale profile you assign. The tips of the third inner ring, which correspond to a smallest feature-size of 120 nm, are barely not resolved (see Figure 5b ), in general agreement with the linear test sample. Second, a Siemens star test sample with 30 nm smallest features was imaged. When you open them in Photoshop, you’ll see something like this: The half-pitch cutoff resolution was estimated to be 145 nm as depicted in Figure 5a. If you want bigger targets, scale them using bilinear interpolation. If you want to print on smaller paper, crop the targets, but print at 360 or 300 ppi. To download a file, right-click on the link below, then choose “Save as…”įor optimal results, don’t scale the targets send them to your printer driver at 360 ppi in the case of the Epson files, or 300 ppi for the Canon ones. There are three stars for Epson printers, which want 360 ppi input images, and three for Canon printers, which take 300 pi images. All are sized for 16-inch (410 mm) stars. Below are links to six printable targets.
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