degradation recente de l'image après le redimensionnement

Community Beginner ,
Feb 28, 2021 Feb 28, 2021

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depuis qq jours alors que je travaille mais photo en RAW, il semble qu'elles se degradent fortement apres les avoir redimensionnées

dans cette image par exemple les cheveux ne sont plus qu'une suite de point apres redimensionnement alors que le plein format semble impeccable

Des poins brillants apparaissent sur le visage....

Je n'avais pas encore constater ce prblm

est ce que l'un-e d'entr vous connait cette anomalie

Merci de votre aide

 

PS je realise ce redimensionnement en une fois  comme je l'ai toujours fait...

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FAQ, Problem or error, Windows

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correct answers 1 Correct Answer

Most Valuable Participant , Feb 28, 2021 Feb 28, 2021
Your lens was also wide open f2.8 at 60mm the focus on the tip of the nose is extreamly sharp in focus. The depth of field very shalow.  I set my default Sharpening preferences to plain Bicubic  I never really scale up in size and  with good  lens camera and Processing I do not want any extra sharpening added. Here is you image with just Bicubic,

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Adobe Community Professional ,
Feb 28, 2021 Feb 28, 2021

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It seems you used the Resample Method »Nearest Neighbor«. 

Screenshot 2021-02-28 at 12.27.09.png

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Community Beginner ,
Feb 28, 2021 Feb 28, 2021

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wouhaou, un grand merci, je ne sais pas pourquoi j'ai remplacé "bicubic shaper" par "nearest neighbor". en tout cas merci pour cette promptitude a me repondre

 

Reste une question: quand utilise-t-on Neirest Neighbor et autres algorythme? (bilinear, bicubic)

Merci 

 

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Adobe Community Professional ,
Feb 28, 2021 Feb 28, 2021

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Automatic may serve you best if you don’t want to get into specifics. 

 

I see little use for Bilinear at current, Nearest Neighbor can be used if one wants to maintain only existing colors or if one wants an image consisiting of »pixels« that really consist of 4x4, 9x9, … pixels, the Preserve Details methods are exclusively for upsampling. 

https://helpx.adobe.com/photoshop/using/image-size-resolution.html#resampling

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Most Valuable Participant ,
Feb 28, 2021 Feb 28, 2021

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Your lens was also wide open f2.8 at 60mm the focus on the tip of the nose is extreamly sharp in focus. The depth of field very shalow.  I set my default Sharpening preferences to plain Bicubic  I never really scale up in size and  with good  lens camera and Processing I do not want any extra sharpening added. Here is you image with just Bicubic,

image.png

JJMack

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Community Beginner ,
Apr 03, 2021 Apr 03, 2021

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Désolé JJM mais ce mail était dans les spams et je le découvre aujourd'hui.

J'essaie  cette option dans la journée et vous remercie

Gc

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Community Beginner ,
Apr 04, 2021 Apr 04, 2021

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les tests montrent un excellent resultat 

Merci JJMack

 

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