{"id":2522,"date":"2026-04-21T22:51:00","date_gmt":"2026-04-21T20:51:00","guid":{"rendered":"https:\/\/voyage-astrophoto.fr\/?p=2522"},"modified":"2026-05-26T14:37:35","modified_gmt":"2026-05-26T12:37:35","slug":"amas-de-galaxies-hd-drizzle","status":"publish","type":"post","link":"https:\/\/voyage-astrophoto.fr\/index.php\/2026\/04\/21\/amas-de-galaxies-hd-drizzle\/","title":{"rendered":"Amas de galaxies HD (drizzle)"},"content":{"rendered":"\n

Sur ma lanc\u00e9e de la prise de vue du Groupe Compact de Hickson 68 (HCG68)<\/em><\/strong> de la veille, qui a donn\u00e9 de bons r\u00e9sultats, je souhaite profiter des quelques nuits claires suivantes pour m’attaquer \u00e0 un autre amas de galaxies : le groupe d’Abell 1367<\/em><\/strong>.<\/p>\n\n\n\n

Trois nuits de prises de vues sur cet amas (18, 19 et 20 avril) vont me permettre d’avoir une bonne quantit\u00e9 de photos pour voir des dizaines de galaxies, mais aussi pour tester une nouvelle fonctionnalit\u00e9 : le drizzle<\/strong>. \u263a<\/p>\n\n\n\n

Avec plus de 400 images empil\u00e9es, le r\u00e9sultat est d\u00e9j\u00e0 propre et int\u00e9ressant.<\/p>\n\n\n

\n
\"\"
Amas de galaxies Abell 1367 (243 galaxies)
443 images de 2 min, soit 14.8h de pose
Canon EOS 700D 800ISO<\/figcaption><\/figure>\n<\/div>\n\n\n

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

Il y a un total de … 243 galaxies dans l’image ! \ud83d\ude43<\/p>\n\n\n

\n
\"\"
Les 243 galaxies pr\u00e9sentes sur la photo<\/figcaption><\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

Il y a \u00e9norm\u00e9ment de galaxies, mais elles sont quand m\u00eame tr\u00e8s petites dans l’image. Cela me donne l’id\u00e9e d’utiliser la fonctionnalit\u00e9 de \u00ab\u00a0drizzle\u00a0\u00bb, qui permet d’augmenter la r\u00e9solution (les d\u00e9tails) de l’image finale si les images empil\u00e9e sont toutes l\u00e9g\u00e8rement d\u00e9cal\u00e9es les unes par rapport aux autres.<\/p>\n\n\n\n

Je copie-colle une d\u00e9finition qui me semble plut\u00f4t claire.<\/p>\n\n\n\n

\n

L’algorithme drizzle r\u00e9alise une addition optimale des images en terme de r\u00e9solution spatiale. Le principe utilis\u00e9 est qu’\u00e0 une \u00e9chelle inf\u00e9rieure \u00e0 la taille du pixel, le d\u00e9calage entre les images d’une s\u00e9quence peut \u00eatre consid\u00e9r\u00e9 comme al\u00e9atoirement distribu\u00e9. Par exemple, une \u00e9toile dans la premi\u00e8re image peut \u00eatre centr\u00e9e exactement au milieu d’un pixel, alors que dans la seconde image elle peut se retrouv\u00e9e \u00e0 cheval sur deux pixels adjacents. A partir du moment o\u00f9 le d\u00e9calage entre les images est connu \u00e0 une fraction de pixel pr\u00e8s, il est possible de produire une image finale dans une grille plus fine que celle des images de d\u00e9part, avec une am\u00e9lioration de la r\u00e9solution. La r\u00e9solution est en fait am\u00e9lior\u00e9e uniquement si les images de d\u00e9part sont sous-\u00e9chantillonn\u00e9es ou \u00e0 la limite du sous \u00e9chantillonnage (voir plus loin). Dans les fait, l’\u00e9nergie des pixels des images de d\u00e9part est projeter dans une image d’arriv\u00e9e ayant des pixels plus fins. Cette \u00e9nergie est saupoudr\u00e9e en tenant compte du d\u00e9calage fractionnaire entre image, d’o\u00f9 le nom de drizzle donn\u00e9 \u00e0 cet algorithme.<\/p>\n\n\n\n

Le drizzle est adapt\u00e9 uniquement aux images sous-\u00e9chantillonn\u00e9es ou proches de l’\u00eatre. Une image est sous \u00e9chantillonn\u00e9es si la largeur \u00e0 mi-hauteur des \u00e9toiles est inf\u00e9rieure \u00e0 2 pixels. Ce cas se rencontre si la taille des pixels est trop importante par rapport \u00e0 la distance focale du t\u00e9lescope (le but recherch\u00e9 est souvent ici un grand champ de vue). Il faut aussi bien sur que l’optique produise en elle-m\u00eame des images tr\u00e8s piqu\u00e9es, tr\u00e8s fines, exempte d’aberrations majeures. Certains tr\u00e8s bon r\u00e9fracteur ou optiques photographiques sont capables de produire de telles images. Le drizzling fonctionne encore si la largeur \u00e0 mi-hauteur d\u00e9passe le seuil de sous-\u00e9chantillonnage, par exemple avec un FWHM de 2,5 pixels, mais le gain en r\u00e9solution diminue vite. Ce gain peut \u00eatre important si la largeur \u00e0 mi-hauteur est inf\u00e9rieure \u00e0 2 pixel, de 50% typiquement ou m\u00eame plus.<\/p>\n<\/blockquote>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

Pour appliquer cette fonctionnalit\u00e9, il faut retraiter toutes les photos \u00ab\u00a0de z\u00e9ro\u00a0\u00bb, avec les bons param\u00e9trages dans Siril. L’inconv\u00e9nient de cette m\u00e9thode, c’est que la taille des images est doubl\u00e9e (si on fait un \u00ab\u00a0drizzle x2\u00a0\u00bb). Il faut avoir beaucoup d’espace disque sur le PC avec des centaines d’images \u00e0 traiter. Et le temps de traitement est \u00e9galement beaucoup plus long.<\/p>\n\n\n\n

J’ai adapt\u00e9 le script SIRIL existant OSC_Preprocessing_BayerDrizzle.ssf<\/em>, en rempla\u00e7ant -scale=1.0 par -scale=2<\/strong>.0 pour avoir une r\u00e9solution finale double.<\/p>\n\n\n\n\nExported from Notepad++<\/title>\n<style type=\"text\/css\">\nspan {\n\tfont-family: 'Courier New';\n\tfont-size: 6pt;\n\tcolor: #000000;\n}\n.sc0 {\n}\n.sc2 {\n\tcolor: #008000;\n}\n.sc3 {\n\tcolor: #FF0000;\n}\n.sc4 {\n\tfont-weight: bold;\n\tcolor: #0000FF;\n}\n.sc7 {\n\tfont-weight: bold;\n\tcolor: #804000;\n}\n.sc8 {\n}\n.sc9 {\n\tfont-weight: bold;\n\tcolor: #FF8040;\n\tbackground: #FFFFD9;\n}\n<\/style>\n\n\n<div style=\"float: left; white-space: pre; line-height: 1; background: #FFFFFF; \"><span class=\"sc2\">############################################<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\">#<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># Script for Siril 1.4<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># December 2024<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># (C) Cyril Richard<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># OSC_Preprocessing_WBayerDrizzle v1.1<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\">#<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\">########### PREPROCESSING SCRIPT ###########<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\">#<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># Script for color camera preprocessing<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># aligning using Bayer Drizzle<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\">#<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># Needs 4 sets of RAW images in the working<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># directory, within 4 directories:<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># biases\/<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># flats\/<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># darks\/<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># lights\/<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\"># Saves masters to .\/masters\/<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\">#<\/span><span class=\"sc0\">\n<\/span><span class=\"sc2\">############################################<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc8\">requires<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">1<\/span><span class=\"sc7\">.<\/span><span class=\"sc3\">3<\/span><span class=\"sc7\">.<\/span><span class=\"sc3\">4<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Convert Bias Frames to .fit files<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">biases<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">convert<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">bias<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Stack Bias Frames to bias_stacked.fit<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">stack<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">bias<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">rej<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">nonorm<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">masters<\/span><span class=\"sc7\">\/<\/span><span class=\"sc8\">bias_stacked<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Convert Flat Frames to .fit files<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">flats<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">convert<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">flat<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Calibrate Flat Frames<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">calibrate<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">flat<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">bias<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">masters<\/span><span class=\"sc7\">\/<\/span><span class=\"sc8\">bias_stacked<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Stack Flat Frames to pp_flat_stacked.fit<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">stack<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">pp_flat<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">rej<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">norm<\/span><span class=\"sc7\">=<\/span><span class=\"sc8\">mul<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">masters<\/span><span class=\"sc7\">\/<\/span><span class=\"sc8\">pp_flat_stacked<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Convert Dark Frames to .fit files<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">darks<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">convert<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">dark<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Stack Dark Frames to dark_stacked.fit<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">stack<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">dark<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">rej<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">nonorm<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">masters<\/span><span class=\"sc7\">\/<\/span><span class=\"sc8\">dark_stacked<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Convert Light Frames to .fit files<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">lights<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">convert<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">light<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..\/<\/span><span class=\"sc8\">process<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Calibrate Light Frames<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">calibrate<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">light<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">dark<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">masters<\/span><span class=\"sc7\">\/<\/span><span class=\"sc8\">dark_stacked<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">flat<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">masters<\/span><span class=\"sc7\">\/<\/span><span class=\"sc8\">pp_flat_stacked<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">cc<\/span><span class=\"sc7\">=<\/span><span class=\"sc8\">dark<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">cfa<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">equalize_cfa<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Align lights with Drizzle<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">register<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">pp_light<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">drizzle<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">scale<\/span><span class=\"sc7\">=<\/span><span class=\"sc3\">2<\/span><span class=\"sc7\">.<\/span><span class=\"sc3\">0<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">pixfrac<\/span><span class=\"sc7\">=<\/span><span class=\"sc3\">1<\/span><span class=\"sc7\">.<\/span><span class=\"sc3\">0<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">kernel<\/span><span class=\"sc7\">=<\/span><span class=\"sc8\">square<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">flat<\/span><span class=\"sc7\">=..\/<\/span><span class=\"sc8\">masters<\/span><span class=\"sc7\">\/<\/span><span class=\"sc8\">pp_flat_stacked<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># Stack calibrated lights to result.fit<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">stack<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">r_pp_light<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">rej<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc3\">3<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">norm<\/span><span class=\"sc7\">=<\/span><span class=\"sc8\">addscale<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">output_norm<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">rgb_equal<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc3\">32<\/span><span class=\"sc8\">b<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">out<\/span><span class=\"sc7\">=<\/span><span class=\"sc8\">result<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc2\"># and flipping if required<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">load<\/span><span class=\"sc0\"> <\/span><span class=\"sc8\">result<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">mirrorx<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">–<\/span><span class=\"sc8\">bottomup<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">save<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..\/<\/span><span class=\"sc8\">result_drizzle_<\/span><span class=\"sc9\">$LIVETIME<\/span><span class=\"sc7\">:%<\/span><span class=\"sc8\">d<\/span><span class=\"sc9\">$s<\/span><span class=\"sc0\">\n\n<\/span><span class=\"sc4\">cd<\/span><span class=\"sc0\"> <\/span><span class=\"sc7\">..<\/span><span class=\"sc0\">\n<\/span><span class=\"sc8\">close<\/span><span class=\"sc0\">\n<\/span><\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Et le r\u00e9sultat est juste incroyable quand on zoome sur l’image. \ud83d\ude2e<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Avec exactement les m\u00eames traitements sur les deux images, l’image avec la r\u00e9solution doubl\u00e9e pr\u00e9sente des \u00e9toiles beaucoup plus rondes, des galaxies avec beaucoup plus de d\u00e9tail, et m\u00eame des \u00e9toiles en plus !<\/p>\n\n\n<div class=\"align wp-block-icb-image-compare\" 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