The most uniform light source available would be an integrating sphere, but these come with considerable size and expense. After considering how the light source uniformity impacts their results, most lab & manufacturing tests use LED or fluorescent lightboxes with flat-panel diffusers. (more…)
In our last chart quality investigation we looked at the fine detail of transmissive (backlit) test charts. Now we will look in to the properties of reflective charts.
Imatest currently offers three types of reflectively-illuminated test chart. Most of the charts we produce are printed on a high quality inkjet printer on matte or semi-gloss (luster) papers. We also have a chart that is produced with a photographic process. We will determine which of these substrates has the sharpest edge and quantify the difference.
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