issue151:tutoriel2
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Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédente | ||
issue151:tutoriel2 [2019/12/09 20:51] – d52fr | issue151:tutoriel2 [2019/12/10 14:54] (Version actuelle) – auntiee | ||
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**In this day and age, photography is rife. We all carry around digital cameras integrated into our smartphones that vie with professional grade equipment from a couple of decades ago. Moreover, we can take just about as many shots, and in higher quality, as abody (other than a professional or an advanced enthusiast) could have done until very recently. We are also r sather well-equipped - from a software standpoint - to manage and modify our pictures, altering them for different purposes. However, this situation is not the result of an abrupt change in our photographic habits: I am sure many readers of these columns have a history of taking photos in earlier times, perhaps using rather less capable digital equipment, or even physical films developed using a chemical process. I know I still retain several boxes of such at home, hundreds of paper prints, as well as the cameras that I used to take them. Though they may seem quaint and perhaps better suited to a small museum than to a modern lifestyle, it is no less true that these pictures bring back memories of times gone by, of places and of people - some of whom are no longer in this world. In addition, I also conserve several photos made by other people, related to family circumstances, | **In this day and age, photography is rife. We all carry around digital cameras integrated into our smartphones that vie with professional grade equipment from a couple of decades ago. Moreover, we can take just about as many shots, and in higher quality, as abody (other than a professional or an advanced enthusiast) could have done until very recently. We are also r sather well-equipped - from a software standpoint - to manage and modify our pictures, altering them for different purposes. However, this situation is not the result of an abrupt change in our photographic habits: I am sure many readers of these columns have a history of taking photos in earlier times, perhaps using rather less capable digital equipment, or even physical films developed using a chemical process. I know I still retain several boxes of such at home, hundreds of paper prints, as well as the cameras that I used to take them. Though they may seem quaint and perhaps better suited to a small museum than to a modern lifestyle, it is no less true that these pictures bring back memories of times gone by, of places and of people - some of whom are no longer in this world. In addition, I also conserve several photos made by other people, related to family circumstances, | ||
- | Aujourd' | + | Aujourd' |
**As may or may not seem logical, I would now like to retrieve some of these documents, and work on them to enhance their technical quality that, in cases, has been sadly let down by what was possible at the time. Some images are faded and yellow from the oxidation of their pigments. Others have creases and dots on them. The earliest are in black-and-white, | **As may or may not seem logical, I would now like to retrieve some of these documents, and work on them to enhance their technical quality that, in cases, has been sadly let down by what was possible at the time. Some images are faded and yellow from the oxidation of their pigments. Others have creases and dots on them. The earliest are in black-and-white, | ||
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This has been the main source of inspiration for this series, in which I will be going on my internal journey of learning to make something of the old photos in my possession, and others in the public domain due to their age. You, the reader, are welcome to tag along, and I hope to glean some small insight and perhaps an idea or two from time to time. No promises are made as to the quality of the content, or potential errors and omissions. I am a computer scientist, not a true artist or a professional of image restoration. So please take all this as a best effort, but with no firm guarantees - much as is the case of most open-source software. Naturally, being a Linux user, that is what I will be using: open-source applications, | This has been the main source of inspiration for this series, in which I will be going on my internal journey of learning to make something of the old photos in my possession, and others in the public domain due to their age. You, the reader, are welcome to tag along, and I hope to glean some small insight and perhaps an idea or two from time to time. No promises are made as to the quality of the content, or potential errors and omissions. I am a computer scientist, not a true artist or a professional of image restoration. So please take all this as a best effort, but with no firm guarantees - much as is the case of most open-source software. Naturally, being a Linux user, that is what I will be using: open-source applications, | ||
- | Que ça paraisse logique ou pas, j' | + | Que ça paraisse logique ou pas, j' |
- | C'est ce qui a été ma source d' | + | C'est ce qui a été ma source d' |
**A choice of program | **A choice of program | ||
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However, for this series I have preferred to focus on a different program, Krita, that is perhaps slightly less well-known to the general community outside of people involved in visual art, being more focused towards artistic drawing than GIMP. It came to my attention when researching software to use with the recent acquisition, | However, for this series I have preferred to focus on a different program, Krita, that is perhaps slightly less well-known to the general community outside of people involved in visual art, being more focused towards artistic drawing than GIMP. It came to my attention when researching software to use with the recent acquisition, | ||
+ | |||
+ | Un choix de programme | ||
+ | |||
+ | Les distributions modernes de GNU/Linux proposent beaucoup de programmes pour travailler sur des photos et d' | ||
+ | |||
+ | Cependant, pour cette série, j'ai préféré me focaliser sur un programme différent, Krita, qui est peut-être légèrement moins connu de la communauté générale, en dehors des gens qui s' | ||
**Krita is based on the Qt widget set, and thus often associated with the KDE Plasma desktop. But, as with most modern applications, | **Krita is based on the Qt widget set, and thus often associated with the KDE Plasma desktop. But, as with most modern applications, | ||
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Krita should also be easily available in graphical software managers, though I cannot say I have tried out that route.** | Krita should also be easily available in graphical software managers, though I cannot say I have tried out that route.** | ||
+ | |||
+ | Krit est basé sur l' | ||
+ | |||
+ | sudo apt update ; sudo apt install krita | ||
+ | |||
+ | Krita est en général disponible aussi dans les gestionnaires graphiques de logiciels, dont je ne puis rien dire, n' | ||
**Acquiring the images | **Acquiring the images | ||
Before working on any specific images, they must, at some point, be converted to a format compatible with computers. Pictures taken with digital cameras may be stored on hard drives, or even USB-connected pen-drives. These formats will usually give no problem, as long as some means of connection is available. The situation may become more complex with the CD-ROMs that many camera-film developers provided alongside paper copies in the final years of chemical film usage - since most modern computers lack an optical drive. An older laptop may be of use, though I would advise a liberal application of compressed air to clean some of the accumulated dust out before putting such bask in use reading CDs. An external CD reader connected to our main computer via USB may be a better alternative; | Before working on any specific images, they must, at some point, be converted to a format compatible with computers. Pictures taken with digital cameras may be stored on hard drives, or even USB-connected pen-drives. These formats will usually give no problem, as long as some means of connection is available. The situation may become more complex with the CD-ROMs that many camera-film developers provided alongside paper copies in the final years of chemical film usage - since most modern computers lack an optical drive. An older laptop may be of use, though I would advise a liberal application of compressed air to clean some of the accumulated dust out before putting such bask in use reading CDs. An external CD reader connected to our main computer via USB may be a better alternative; | ||
+ | |||
+ | Acquisition d' | ||
+ | |||
+ | Avant de travailler sur des images spécifiques, | ||
**Some time ago, flatbed scanners were a widely-used peripheral to convert physical documents to digital form. I still have one on a shelf somewhere, which I could plug in and use in conjunction with the Simple Scan software that comes with Ubuntu these days. However, I will not be using it to convert paper prints to digital form for the following reason. My desktop scanner, like most, has a resolution of 300 dpi (dots per inch). When applied to a standard paper print of about 4 by 6 inches, or 10 by 15 cm, this gives a digital file with resolution 1200 x 1800 pixels. But my cheap Samsung phone has a camera with a resolution that goes up to 4128 x 3096 pixels (13 Megapixels). So one can achieve both better resolution and an easier workflow to transfer the images to a computer by simply taping the prints to a vertical wall in a well-illuminated place, and taking a picture of them with the mobile phone’s camera. This is the miracle of technology ever moving forward. Just make sure to take the photos from a point as squarely in front of the original as possible, and do not let shadows or the use of a flash mar the result.** | **Some time ago, flatbed scanners were a widely-used peripheral to convert physical documents to digital form. I still have one on a shelf somewhere, which I could plug in and use in conjunction with the Simple Scan software that comes with Ubuntu these days. However, I will not be using it to convert paper prints to digital form for the following reason. My desktop scanner, like most, has a resolution of 300 dpi (dots per inch). When applied to a standard paper print of about 4 by 6 inches, or 10 by 15 cm, this gives a digital file with resolution 1200 x 1800 pixels. But my cheap Samsung phone has a camera with a resolution that goes up to 4128 x 3096 pixels (13 Megapixels). So one can achieve both better resolution and an easier workflow to transfer the images to a computer by simply taping the prints to a vertical wall in a well-illuminated place, and taking a picture of them with the mobile phone’s camera. This is the miracle of technology ever moving forward. Just make sure to take the photos from a point as squarely in front of the original as possible, and do not let shadows or the use of a flash mar the result.** | ||
+ | |||
+ | Il y a quelque temps, les scanners à plat étaient un périphérique largement utilisé pour convertir des documents physiques dans un format numérique. | ||
**Series outline | **Series outline | ||
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Interested viewers may wish to download this image, explore its various technical difficulties as a restoration project, and perhaps play around a little before the next episode. Until then, take care!** | Interested viewers may wish to download this image, explore its various technical difficulties as a restoration project, and perhaps play around a little before the next episode. Until then, take care!** | ||
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+ | Plan de cette série | ||
+ | |||
+ | Dans la prochaine partie de cette série, nous commencerons à travailler sur un simple paysage, la photo du château de Foix dans le sud de la France, au tournant du 20e siècle. Avec le passage du temps, il est prévu que cette photo tombe maintenant dans le domaine public. Elle a déjà été numérisée par le projet Rosalis de la bibliothèque municipale de Toulouse et peut être téléchargée depuis Wikicommons à l' | ||
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+ | Les lecteurs intéressés peuvent télécharger cette image, explorer ses diverses difficultés techniques en tant que projet de restauration et, peut-être, jouer un peu avec avant le prochain épisode. Jusque-là, prennez soin de vous ! | ||
issue151/tutoriel2.1575921084.txt.gz · Dernière modification : 2019/12/09 20:51 de d52fr