{"id":9560,"date":"2014-03-08T22:58:40","date_gmt":"2014-03-08T22:58:40","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/solar-imaging-in-ha-with-small-scale-aperture-telescopes-a-new-contrast-enhancement-technique\/"},"modified":"2025-06-08T22:46:28","modified_gmt":"2025-06-08T20:46:28","slug":"solar-imaging-in-ha-with-small-scale-aperture-telescopes-a-new-contrast-enhancement-technique","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/solar-imaging-in-ha-with-small-scale-aperture-telescopes-a-new-contrast-enhancement-technique\/","title":{"rendered":"Solar imaging in Ha with small scale aperture telescopes – A new contrast enhancement technique"},"content":{"rendered":"

Contrast enhancement on Hydrogen-Alpha pictures<\/strong>
\nRehaussement du contraste sur les images en Hydrog\u00e8ne – Alpha<\/strong><\/em><\/p>\n

Can we do more to accommodate the quite flat image coming out of the capture process? What do we end up with after the stacking? An image having a much higher dynamic range, as many 8-bit (10, 12-bit… for recent cameras) primary captures result into a high depth resolution image. Read the words: Higher … Dynamic … Range!
\nQue pouvons-nous faire de plus pour rehausser les images plates sortant du processus de capture ? De quoi disposons-nous apr\u00e8s le stack? Une image ayant beaucoup plus de signal, comme un grand nombre de captures primaires \u00e0 8 bits (10, 12 bits … pour les cam\u00e9ras r\u00e9centes) r\u00e9sultent en une image avec une gamme dynamique tr\u00e8s haute. Lisez bien: Haute Gamme Dynamique.<\/em><\/p>\n

Nowadays, we find in our software portfolio new kinds of tools known by the acronym HDR, standing for High Dynamic Range processing. Carrying on in this direction and searching for an easy one-for-all contrast treatment function, I discovered in a quite recent version of Photoshop a similar feature to balance the image dynamic: HDR Toning.
\nAujourd’hui, nous trouvons dans notre portefeuille de logiciels de nouveaux types d’outils r\u00e9pertori\u00e9s sous l’acronyme HDR – High Dynamic Range-, pour le traitement des images \u00e0 haute dynamique. Poursuivant dans cette direction et de cherchant une fonction de traitement de contraste tout-en-un, j’ai d\u00e9couvert dans une version assez r\u00e9cente de Photoshop une outil similaire pour \u00e9quilibrer la dynamique des images: Virage HDR (HDR Toning).
\n<\/em><\/p>\n

Here, a comparison.
\nIci, une comparaison.<\/em>
\nFig. The smiley sun. A 3MPix mosaic of 6 frames taken with a single stack 0.7\u00c5 filter 60mm x2.4 setup. For each frame, the batch stacking keeps 100 raw captures out of 30s sequences @30fps\/8-bit. The individual frames are then combined into an image, sharpened, the contrast enhanced with HDR Toning before colorization.
\nFig . The smiley sun. Une mosa\u00efque d\u2019une taille de 3Mpix compos\u00e9e de 6 images prises avec un setup de 60mm, combin\u00e9 \u00e0 une barlow de x2.4 et un filtre de 0.7A en simple stack. Pour chaque image, le stack par lot conserve 100 captures hors de s\u00e9quences primaires de 30s @30fps\/8-bit . Les images individuelles sont ensuite combin\u00e9es en une mosa\u00efque, affin\u00e9es et le contraste relev\u00e9 avec virage HDR avant colorisation.<\/em><\/p>\n

Standard treatment:<\/strong>
\nLe traitement standard:<\/em>
\n<\/p>\n

Full res:<\/a><\/p>\n

Enhanced treatment:<\/strong>
\nLe traitement am\u00e9lior\u00e9:<\/em>
\n<\/p>\n

Full res:<\/a><\/p>\n


\nHDR Toning treatment:<\/strong>
\nTraitement HDR Toning:<\/em>
\n<\/p>\n

Full res:<\/a><\/p>\n

The full article about solar imaging is here:<\/strong>
\nL\u2019article complet sur l\u2019imagerie solaire est ici:<\/em>
\nhttp:\/\/www.groupeastronomiespa.be\/SolarImagingHaSmallAper01Full_11.pdf<\/a><\/p>\n

allhoest<\/p>\n\n\n

\n \n
\n \n
\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n <\/div>\n \n
\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n
\n \n\n
<\/div>\n <\/div>\n <\/div>\n<\/div>\n \n\n
\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

Contrast enhancement on Hydrogen-Alpha pictures Rehaussement du contraste sur les images en Hydrog\u00e8ne – Alpha Can we do more to accommodate the quite flat image coming out of the capture process? What do we end up with after the stacking? An image having a much higher dynamic range, as many 8-bit (10, 12-bit… for recent […]<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-9560","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=9560"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9560\/revisions"}],"predecessor-version":[{"id":12126,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9560\/revisions\/12126"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=9560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=9560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=9560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}