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Forumosky • Leggi argomento - Visualizzatore Windows aumenta la dimensione file

Visualizzatore Windows aumenta la dimensione file

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Visualizzatore Windows aumenta la dimensione file

Messaggioda ghisirds » sab set 15, 2007 10:28 pm

Salve.
Dopo aver scaricato le immagini fatte con la mia macchina digitale da 3,2 megapixel, spesso le guardo con il visualizzatore immagini di windows e se è il caso le ruoto.
Ho notato però che, salvandole con quel programma, mi ingrandisce la dimensione del file. Perchè?
Il formato delle foto è in .jpg e le salvo, dopo averle guardate e nel caso ruotate, sempre con quello stesso formato: suppongo che sia un problema di qualità della compressione jpg .
Si può modificare questo valore? Oppure, ancora meglio, fare in modo che rimanga invariato?
Grazie

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Messaggioda dariosky » dom set 16, 2007 11:18 am

Ciao ghisirds,
come probabilmente sai, il formato JPEG è un formato che comporta perdita di informazioni (in genere, a seconda della qualità, impercettibile) ogni volta che salvi. Per ruotare le JPEG per questo non vanno decompresse girate e ricompresse (come da come dici) fa il visualizzatore di Windows, ma solamente ruotate agendo sugli header del file, in modo da non aver perdita.
Ti suggerisco un bellissimo programma gratuito per Windows: che tra le altre ha le rotazioni a destra e sinistra loseless (senza perdita)... gli shortcut sono CTRL+SHIFT+R o L.

PS. Quei link in firma sanno molto da spam ... :-?
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