issue152:darktable
Différences
Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédente | ||
issue152:darktable [2020/01/05 09:26] – d52fr | issue152:darktable [2020/01/06 11:02] (Version actuelle) – auntiee | ||
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As promised, this issue we look into the wonderful world of LUTs. | As promised, this issue we look into the wonderful world of LUTs. | ||
- | This is what we currently have (pre Darktable 2.6) : https:// | + | This is what we currently have (pre Darktable 2.6) : https:// |
- | Si vous suivez régulièrement nos tutoriels sur Darktable, vous avez que nous travaillons avec la dernière version, et pas celle qui est présente dans le Centre de logiciels d' | + | Si vous suivez régulièrement nos tutoriels sur Darktable, vous savez que nous travaillons avec la dernière version, et pas celle qui est présente dans le Centre de logiciels d' |
Avertissement : je ne suis nullement un expert en traitement des photos. Je connais simplement un gars qui a un chien qui m'a donné des puces. Je pensais que je pouvais vous aider à vous gratter aussi. | Avertissement : je ne suis nullement un expert en traitement des photos. Je connais simplement un gars qui a un chien qui m'a donné des puces. Je pensais que je pouvais vous aider à vous gratter aussi. | ||
- | Comme promis, dans ce numéro, nous examinons le monde merveilleux | + | Comme promis, dans ce numéro, nous examinons le monde merveilleux |
- | Voici ce que nous avons actuellement (avant Darktable 2.6) : https:// | + | Voici ce que nous avons actuellement (avant Darktable 2.6) : https:// |
**But, in the newer versions (Darktable 2.7+), we have LUT 3D. But what is it you may ask? Well LUT is short for Look-Up Table. Why do we need it? LUTs allow us to change color spaces. That said, technically, | **But, in the newer versions (Darktable 2.7+), we have LUT 3D. But what is it you may ask? Well LUT is short for Look-Up Table. Why do we need it? LUTs allow us to change color spaces. That said, technically, | ||
- | Mais dans les versions plus récentes (Dartable | + | Mais dans les versions plus récentes (Darktable |
**So what is a 3D Lut? Well think of it as an array in 3 dimensions. Read more here: https:// | **So what is a 3D Lut? Well think of it as an array in 3 dimensions. Read more here: https:// | ||
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Again, I am no expert, but people are visual creatures and sometimes we need to picture something to understand it. Not all of us need to be experts in everything, and that is OK, you just need to know enough to enjoy something. ** | Again, I am no expert, but people are visual creatures and sometimes we need to picture something to understand it. Not all of us need to be experts in everything, and that is OK, you just need to know enough to enjoy something. ** | ||
- | Et qu' | + | Et qu' |
- | À nouveau, je ne suis pas un expert, mais les gens sont des créatures dotées | + | Encore une fois, je ne suis pas un expert, mais les gens sont des créatures dotées |
**To understand LUTs, let’s look at their origins. LUTs started because of the need to match the output of different cameras. Though it is still used for this, it has become so much more. | **To understand LUTs, let’s look at their origins. LUTs started because of the need to match the output of different cameras. Though it is still used for this, it has become so much more. | ||
Think of LUTs as a quick way to apply a color preset, like Snapseed on your phone does. That said, it is not a complete automation, as you still need to denoise or sharpen manually. LUTs apply to colors. There are basically two types us n00bs need to be aware of – the type they use in film production (CUBE FILES), and the type we use in digital photography (HALDCLUT FILES). So be sure you download the correct one, though you *can use the cube files, the latter is preferred. Should you see 3DL files or MGA-files; these are LUTs too, but just be aware that not all types of LUT files are supported by every photo manipulation application. If you have used RawTherapee or Photoflow, you will know which you need. All well and good, but where can you get LUTs? Here is a starting point: https:// | Think of LUTs as a quick way to apply a color preset, like Snapseed on your phone does. That said, it is not a complete automation, as you still need to denoise or sharpen manually. LUTs apply to colors. There are basically two types us n00bs need to be aware of – the type they use in film production (CUBE FILES), and the type we use in digital photography (HALDCLUT FILES). So be sure you download the correct one, though you *can use the cube files, the latter is preferred. Should you see 3DL files or MGA-files; these are LUTs too, but just be aware that not all types of LUT files are supported by every photo manipulation application. If you have used RawTherapee or Photoflow, you will know which you need. All well and good, but where can you get LUTs? Here is a starting point: https:// | ||
- | Pour comprendre LUT, regardons | + | Pour comprendre |
+ | Voyez les LUT comme une façon rapide d' | ||
**If you have metered internet, know that some of these preset packages can be quite large. | **If you have metered internet, know that some of these preset packages can be quite large. | ||
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The only issue here is that if you have lots of LUTs, you will need to click on that mini folder again to open your list, and double-click each one in succession. There is, unfortunately, | The only issue here is that if you have lots of LUTs, you will need to click on that mini folder again to open your list, and double-click each one in succession. There is, unfortunately, | ||
- | Si votre liaison à Internet est limitée, sachez que certains fichiers de préréglages peuvent assez gros. | + | Si votre liaison à Internet est limitée, sachez que certains fichiers de préréglages peuvent |
- | Une fois que vous avez récupéré quelques LUT, vous devez paramétrer un chemin. Dans Darktable, ouvrez les paramètres, | + | Une fois que vous avez récupéré quelques LUT, vous devez paramétrer un chemin. Dans Darktable, ouvrez les paramètres, |
- | Ajoutez le module LUT 3D à votre arsenal de modules. Avec la nouvelle barre de recherche, c'est aussi facile | + | Ajoutez le module LUT 3D à votre arsenal de modules. Avec la nouvelle barre de recherche, c'est aussi facile |
Le seul problème ici est que, si vous avez des tas de LUT, vous aurez à nouveau besoin de cliquer sur ce mini-dossier pour ouvrir votre liste et de cliquer successivement sur chacun. Malheureusement, | Le seul problème ici est que, si vous avez des tas de LUT, vous aurez à nouveau besoin de cliquer sur ce mini-dossier pour ouvrir votre liste et de cliquer successivement sur chacun. Malheureusement, | ||
**LUTs are applied at 100% opacity. You can change that. Feel free to play around with that as it can create some interesting effects. How do you do this, you may ask? Well, next to the big X is an O that you click. (No, we are not playing Tic Tac Toe). If you hover your mouse pointer over this, you will see a tooltip that says “uniformly”. Applying a LUT is not the be-all and end-all of your color correction. You can still go and adjust every aspect of the applied LUT with the other modules. Think of it as a cheat, to get you 90% of the way there (color correction). The differences between some LUTs are very subtle. Do not be afraid to take snapshots to compare them. There is no great skill required to use LUTs. Open one of your LUTs in your file manager and view it with mousepad or leafpad or gedit (whatever your choice of notepad application is), and you will see that a LUT is just text. Lots and lots of numbers.** | **LUTs are applied at 100% opacity. You can change that. Feel free to play around with that as it can create some interesting effects. How do you do this, you may ask? Well, next to the big X is an O that you click. (No, we are not playing Tic Tac Toe). If you hover your mouse pointer over this, you will see a tooltip that says “uniformly”. Applying a LUT is not the be-all and end-all of your color correction. You can still go and adjust every aspect of the applied LUT with the other modules. Think of it as a cheat, to get you 90% of the way there (color correction). The differences between some LUTs are very subtle. Do not be afraid to take snapshots to compare them. There is no great skill required to use LUTs. Open one of your LUTs in your file manager and view it with mousepad or leafpad or gedit (whatever your choice of notepad application is), and you will see that a LUT is just text. Lots and lots of numbers.** | ||
+ | |||
+ | Les LUT sont appliqués à pleine opacité. Vous pouvez le changer. N' | ||
**I say this, as there are lots of free LUTs available on the internet, but you do not want a binary. Always make sure that the so-called LUT you just downloaded is actually a simple text file with numbers like these. Malware on Linux is a thing. Rather be safe than sorry. Though I have seen .EXE-files parading as LUTs, know that a LUT file is simply a lookup table that changes color values. Delete the binaries and find your LUTs elsewhere. Generally, LUTs will work on your Windows and MAC computers too, as they are text. | **I say this, as there are lots of free LUTs available on the internet, but you do not want a binary. Always make sure that the so-called LUT you just downloaded is actually a simple text file with numbers like these. Malware on Linux is a thing. Rather be safe than sorry. Though I have seen .EXE-files parading as LUTs, know that a LUT file is simply a lookup table that changes color values. Delete the binaries and find your LUTs elsewhere. Generally, LUTs will work on your Windows and MAC computers too, as they are text. | ||
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Happy editing and should you have any questions or corrections, | Happy editing and should you have any questions or corrections, | ||
+ | |||
+ | Je dis cela car il y a une grande quantité de LUT gratuits disponibles sur Internet, mais vous ne voulez pas un fichier binaire. Assurez-vous toujours que les fichiers appelés LUT que vous venez de télécharger sont bien des fichiers de texte simple avec des nombres comme ceux-ci. Les maliciels sont une réalité dans Linux et il vaut mieux prévenir que guerrir. Bien que j'aie vu des fichiers .EXE déguisés en LUT, sachez qu'un fichier LUT n'est qu'une table de recherche qui modifie les valeurs des couleurs. Effacez les binaires et cherchez vos LUT ailleurs. Généralement, | ||
+ | |||
+ | Maintenant, à propos des deux types de LUT que j'ai mentionnés au début, le LUT technique fera qu'une image terne ressemblera à ce qu' | ||
+ | |||
+ | Bonnes modifications et si vous avez des questions ou des corrections - eh oui, tout le monde peut se tromper - envoyez-nous un mail à : misc@fullcirclemagazine.org | ||
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issue152/darktable.1578212814.txt.gz · Dernière modification : 2020/01/05 09:26 de d52fr