User talk:Christian.Mercat

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I live and work in Lyon, France. I am a mathematician working at the Université Claude Bernard Lyon 1 director of the Institut de Recherche sur l'Enseignement des Mathématiques.


gif non, png oui, svg mieux[edit]

Bonjour, Je vois que vous importez des images en gif. En principe, c'est reservé aux images animées. Il faut plutot utiliser le format png. Et vu le type d'image, ce serait encore mieux de faire des images vectorielles, au format svg. Bien à vous, Frédéric (talk) 19:04, 25 April 2009 (UTC)

Cher Frédéric, merci du commentaire. Surtout que j'ai fait ça en xfig, mais il y a des années. Je ne retrouve plus la source .fig mais je l'ai en eps. Je peux évidemment le mettre en png, en svg c'eut été mieux...Christian.Mercat (talk) 19:15, 25 April 2009 (UTC)


File:KnotSignedEdge-.png[edit]

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shizhao (talk) 19:59, 25 April 2009 (UTC)

Dear Shizhao, thanks for your report, but if you read carefully the website you cited, you'll see that I am the author of that image and I let my friend Steven Abbott use it on his own website.Christian.Mercat (talk) 20:41, 25 April 2009 (UTC)

File tagging File:KnotSignedEdge+.png[edit]

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shizhao (talk) 20:00, 25 April 2009 (UTC)

Dear Shizhao, thanks for your report, but if you read carefully the website you cited, you'll see that I am the author of that image and I let my friend Steven Abbott use it on his own website.Christian.Mercat (talk) 20:42, 25 April 2009 (UTC)


File tagging File:SmooveBox.png[edit]

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High Contrast (talk) 06:45, 13 June 2009 (UTC)


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File:VélopopStationPorteOulle.jpg[edit]

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High Contrast (talk) 19:40, 29 August 2009 (UTC)

Thanks High Contrast, I forgot to set the right copyright on flickr.

File:VélopopTotem.jpg[edit]

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High Contrast (talk) 19:42, 29 August 2009 (UTC)

Thanks High Contrast, I forgot to set the right copyright on flickr. Christian.Mercat (talk) 12:12, 5 October 2009 (UTC)

Knot table[edit]

KnotsBagTable.svg

I haven't logged in for a while, so this is the first time I've seen this. I like the symmetry in your version, in my version I just drew them by hand and tried to lay it out nicely into a square. One thing that I don't like is that the knots have different "rope widths" and are different shades, so I wonder if you could change that (unless the width has some meaning I'm not aware of). Jkasd 07:09, 23 September 2009 (UTC)

Dear Jkasd, thanks for your message. There is no special meaning to the width, but seeing a left and right side is important to be able to compute the writh of the knot. But the different sizes is just because I found it nicer this way, sorry if you disagree :-) As for the shade, right, I hadn't noticed that before... That's my first work in inkscape of any magnitude so I must have goofed somewhere in the copy-pasting procedure... Christian.Mercat (talk) 12:19, 5 October 2009 (UTC)

Categorization - Libélo-Valence[edit]

Hi Christian,

Thanks for asking about categories for File:Libélo-Valence.jpg. I'd suggest you check out the guidelines at Categories#For_more_appropriate_categorization. The category Category:Community bicycle programs is the most specific category for the image, since it only includes images of programs like Libélo. That category is actually a subcategory of Category:Bicycle_transport, which is a subcategory of Category:Transport. If every image that included transport of some kind was in Category:Transport it would be so overcrowded as to be useless. Similarly, the Category:Community bicycle programs is a subcategory of Category:Vehicle rental which is a subcategory of Category:Automotive industry, which is a subcategory of Category:Industries. Just think of how full that category would be, if it wasn't broken down into subcategories. By using the most specific categories, we can keep things organized.

I noticed that, in terms of location, the most specific category we had was Category:Bicycle racks in France. Since that category has no subcategories, the image should stay there, but I've added Category:Valence (Drôme) to specify that it's in Valence. If, in the future, someone created Category:Bicycle racks in Valence (Drôme), we'd add that category, and remove Category:Valence (Drôme) and Category:Bicycle racks in France.

I hope that all makes sense. - Themightyquill (talk) 23:04, 28 March 2010 (UTC)

On second thought, since you've added a number of images of Libélo, I've created a Category:Libélo and placed most of the images there. - Themightyquill (talk) 23:07, 28 March 2010 (UTC)

Tip: Categorizing images[edit]

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Hello, Christian.Mercat!

Tip: Add categories to your images

Thanks a lot for contributing to the Wikimedia Commons! Here's a tip to make your uploads more useful: Why not add some categories to describe them? This will help more people to find and use them.

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When picking categories, try to choose a specific category ("Astronomical diagrams") over a generic one ("Illustrations"). Pro-tip: The CommonSense tool can help you find the best category for your image.

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Stefan4 (talk) 19:07, 12 November 2012 (UTC)

Julien Cabardi has sent the requested email to Permissions. Christian.Mercat (talk) 23:52, 25 November 2012 (UTC)
Julien Cabardi is going back soon (January 2013) to Batumi and will talk with the townhall people about the rights to reproduce pictures of the seashore, especially the WHERE sculpture. Christian.Mercat (talk) 10:14, 27 December 2012 (UTC)

File tagging File:Enluminure.png[edit]

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Sreejith K (talk) 14:57, 24 November 2012 (UTC)

Dear Sreejith K, thank you for your work. I have sent the email stating the fact that I am the author of the picture. Christian.Mercat (talk) 23:50, 25 November 2012 (UTC)

File tagging File:KnotCrossesOnEdges.png[edit]

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Josve05a (talk) 18:50, 12 August 2014 (UTC)