Purpose: Increase local contrast (enhances text futher). Technique: Copy original layer first, apply Solarize filter, then set layer blending mode to overlay. eliminate highlights and more high frequency noise, increase contrast of text). Purpose: Reduce highlight tones, darken shaded midtones (i.e. Reduce Color Noise eliminates color artifacts that make further processing difficult (color blotches end up getting enhanced with each successive filter or adjustment, making it difficult to see the text.) Purpose: Reduces higher frequency information, again making it easier to bring out contrast of medium scale information. Purpose: Reduces large-scale contrast, making it easier to bring out contrast of medium and smaller scale information (i.e. Here are a few filters, applied one after the other and possibly to new layers, using Photoshop, showing the results: The ultimate key is to reduce noise, as that's largely what makes the text difficult to read (Michael's image is an example of that). Depending on how unimportant the stone itself is, you can take it to some significant extremes. You can run multiple filters to bring out the text.
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