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6 results for “Craquelure”
Use of GIMP Retinex filter to enhance the visibility of craquelure: example n. 1
<p>In the image, A represents the original image. It is a detail of the Portrait of a Young Girl, by Petrus Christus, (high resolution), courtesy Wikipedia. B is the grey-tone corresponding image. C is the image that we can obtain using the GIMP thresholding (threshold tone T = 127), applied to B. D is the image that we can have, applying GIMP Retinex on B (level=low, scale=250, scale div.=8, dynamics=4,0). E is the result of the thresholding of D (T = 127). F is the image obtained by means of the use of generic filter Erode on E. G is the result of applying Retinex (the same parameters used to obtain D) on D. H is the result of thresholding (T = 127), and I is the craquelure as we can see it after applying Erode. L is the Retinex filtered G (the same parameters as for G and D), M is the effect of thresholding and N the final result after using Erode. The example shows that the use of a thresholding on a Retinex filtered image gives much better results than the simple thresholding. This approach, that is the use of Retinex filtering, represents a fast manner for enhancing the visibility of craquelure. The iteration of the Retinex filter is also interesting for working on very dark areas.</p>
Use of GIMP Retinex filter to enhance the visibility of craquelure: example n. 6
<p>In the previously proposed figures (*), the GIMP Retinex filter had been applied to greyscale images, to enhance the visibility of dark craquelure in bright backgrounds. After processing, a black and white map had been obtained, suitable for any possible further processing, even for automatic processing. In (**), we have shown an example of the use of GIMP Retinex to observe the craquelure in dark areas. We observed that when craquelure is present in bright and dark scenes, it seems better to use the GIMP Retinex directly on the colour image. Here an example is given on the Lady Seated at a Virginal, a painting created by Dutch artist Johannes Vermeer (highest resolution), courtesy Wikipedia. A is a detail. A0, A1,A2, A3, and A4 are the images we can obtain by applying GIMP Retinex filter on A, level=low, scale=250, scale div.=8, with dynamics equal to 0,0 1,0 2,0 3,0 and 4,0 respectively. On this detail, it seems that the best manner to enhance the visibility of craquelure is that of using dynamics 2,0. In the lower panel, a larger detail of the painting is given, processed by the filter with dynamics 2,0. The example suggests that use of Retinex filtering on colour images represents a fast manner for enhancing in them the visibility of craquelure.</p> <p>(*) Figures at http://doi.org/10.5281/zenodo.3956124 http://doi.org/10.5281/zenodo.3956204 http://doi.org/10.5281/zenodo.3957439 http://doi.org/10.5281/zenodo.3957799<br> (**) http://doi.org/10.5281/zenodo.3959017</p>
Use of GIMP Retinex filter to enhance the visibility of craquelure: example n. 2
<p>In the image, A represents the original image. It is a detail of the Self-Portrait (Madrid), by Albrecht Dürer, (highest resolution), courtesy Wikipedia. B is the grey-tone corresponding image. C is the image that we can obtain using the GIMP thresholding (threshold tone T = 65), applied to B. D is the image that we can have, applying GIMP Retinex filter on B (level=low, scale=250, scale div.=8, dynamics=4,0). E is the result of applying Retinex once more (the same parameters used to obtain D) on D. The iteration continues obtaining E from D, F from E, and G from F, using the same parameters. H is the result of thresholding the G image (T = 127), and I is the craquelure as it appears, after applying the generic filter Erode of GIMP. The example shows that the use of a thresholding on a Retinex filtered image gives much better results than the simple thresholding. The iteration of the Retinex filter is able to enhance the visibility of the craquelure in the dark areas. This approach, that is the use of Retinex filtering, represents a fast manner for enhancing the visibility of craquelure. Another example is given at http://doi.org/10.5281/zenodo.3956124 .</p>
Use of GIMP Retinex filter to enhance the visibility of craquelure: example n. 4
<p>In the image, A represents the original image. It is a detail of Woman with a Water Jug, a painting finished between 1660–1662 by the Dutch painter Johannes Vermeer (highest resolution), courtesy Wikipedia. B is the grey-tone corresponding image. C is the image that we can obtain using the GIMP thresholding on B, adjusting the value of the threshold to have the best possible visibility of the craquelure. D is the image that we can have, applying GIMP Retinex filter on B (level=low, scale=250, scale div.=8, dynamics=4,0). E is the result of the GIMP generic Erode filter applied to D. F is the result of the GIMP edge detection, obtained by using the so-called “Difference of Gaussians” algorithm, applied to the image E. G is the result of applying Retinex once more (the same parameters used to obtain D) to image D. H is the result of the use of the generic Erode filter on G. I is the result of the GIMP edge detection, “Difference of Gaussians” algorithm. The example shows that the use of an edge detection (F,I) on a Retinex filtered image, enhanced by means of Erode (E,H), gives much better results than the simple thresholding. This approach, that is the use of Retinex filtering, accompanied by other GIMP filters, represents a fast manner for enhancing the visibility of craquelure. Other examples are given at http://doi.org/10.5281/zenodo.3956124 http://doi.org/10.5281/zenodo.3956204 http://doi.org/10.5281/zenodo.3957439</p>
Use of GIMP Retinex filter to enhance the visibility of craquelure: example n. 3
<p>In the image, A represents the original image. It is a detail of the Gioconda, by Leonardo da Vinci, (highest resolution), courtesy Wikipedia. B is the grey-tone corresponding image. C is the image that we can obtain using the GIMP thresholding (threshold tone T = 127), applied to B. D is the image that we can have, applying GIMP Retinex filter on B (level=low, scale=250, scale div.=8, dynamics=4,0). E is the result of applying Retinex once more (the same parameters used to obtain D) on D. The iteration continues obtaining E from D, and F from E, using the same parameters. G, H and I are the result of thresholding of the D, E and F images respectively (T = 127). The example shows that the use of a thresholding on a Retinex filtered image gives much better results than the simple thresholding. The iteration of the Retinex filter is able of enhance the visibility of the craquelure in the dark areas. This approach, that is the use of Retinex filtering, represents a fast manner for enhancing the visibility of craquelure. Other examples are given at http://doi.org/10.5281/zenodo.3956124 and http://doi.org/10.5281/zenodo.3956204</p>
Use of GIMP Retinex filter to enhance the visibility of craquelure: example n. 5
<p>In the previously proposed figures (*), the GIMP Retinex filter had been applied to greyscale images, to enhance the visibility of dark craquelure in bright backgrounds. After processing, a black and white map had been obtained, suitable for any possible further processing, even for automatic processing. Craquelure exists also in dark background, but it is more difficult to enhance its visibility. However, also in this case, the GIMP Retinex filter can be suitable for analyses. In the case that the investigated area, where craquelure is present, contains bright and dark scenes, it seems that it is better to use the GIMP Retinex directly on the colour image. Here an example is given using a detail of the Portrait of a Young Girl, by Petrus Christus, (highest resolution), courtesy Wikipedia. In the image, A represents the original image. B is the grey-tone corresponding image. A1 is the image that we can obtain applying GIMP Retinex on A (level=low, scale=250, scale div.=8, dynamics=2,0). A2 is the image A1, after using the GIMP generic Erode filter. A3 is the result of a thresholding of A2. For what concerns the grey-tone image, B1 is the image that we can obtain using GIMP Retinex on B (level=low, scale=250, scale div.=8, dynamics=4,0). B2 is B1 after using Erode filter. B3 is the result of a thresholding of B2. The example shows that a Retinex filtered image can be useful in the investigation of craquelure in dark areas.</p> <p>(*) Figures at http://doi.org/10.5281/zenodo.3956124 http://doi.org/10.5281/zenodo.3956204 http://doi.org/10.5281/zenodo.3957439 http://doi.org/10.5281/zenodo.3957799</p>
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