louise
23 oct. 2007 à 20:49
Bonjour,
ceci vous aidera-t-il à trouver l'explication???
pour moi, l'anglais, ça va, mais la technique...
j'ai souligné + caractères gras ce qui me paraît constituer une piste... mais ça ne semble pas paraître sur le copier coller... donc, je mets en premier les éléments "sélectionnés" ; ça vs fera peut-être gagner un peu de temps
merci infiniment
louise
§ at least 6 megapixels. This will give a file size of at least 17MB at 8 bit.
§
§ If shooting in JPEG, always use the “Fine” (least compressed) setting.
§
§ Before working on fine JPEG’s, they should first be resaved as tiffs or another non-lossy format, e.g. psd. Never resave JPEG’s in JPEG format - this will result in permanent loss of data and degraded image quality.
§
§ at least 17MB at 8 bit.
§
§ Interpolate (upsize) the file to at least 48MB using a specialist, professional software package. We recommend Genuine Fractals™ although other software is equally acceptable, including Abobe Photoshop versions 7 or higher (if the bicubic option is used).
texte complet:
§ Use a pro-level camera with a “true” (non-interpolated) resolution of at least 6 megapixels. This will give a file size of at least 17MB at 8 bit.
§ Carefully consider your choice of lens. Lens quality is just as important today as it ever was.
§ The choice between shooting in RAW, Tiff or JPEG is a matter for your own workflow. Shoot in RAW for maximum control in post-processing. If shooting in JPEG, always use the “Fine” (least compressed) setting. Modern professional DSLRs produce excellent jpegs, which are visually indistinguishable from RAW or Tiff. With lesser cameras it may be necessary to shoot in RAW to achieve acceptable image quality.
§ Capture images at as low an ISO setting as practicable.
§ Turn off in-camera sharpening.
§ Before working on fine JPEG’s, they should first be resaved as tiffs or another non-lossy format, e.g. psd. Never resave JPEG’s in JPEG format - this will result in permanent loss of data and degraded image quality.
§ RAW files should be checked for correct exposure, colour cast, etc, and any adjustments should be made at this stage. When converting from RAW, ensure sharpening is turned off - it’s on by default in Photoshop.
§ If necessary, rotate the image so that it’s “the right way up”.
§ Do not crop your images excessively - after cropping, your file should still be at least 17MB at 8 bit.
§ Interpolate (upsize) the file to at least 48MB using a specialist, professional software package. We recommend Genuine Fractals™ although other software is equally acceptable, including Abobe Photoshop versions 7 or higher (if the bicubic option is used). Do not use “step” or incremental interpolation. Check your software’s default settings to ensure that sharpening is turned off. All results are assessed on their merits, regardless of the method used.
§ Now open the image at 100%, and check for dust contamination on the sensor. This shows up as dark, circular marks - particularly noticeable in the sky and similar areas. Thoroughly check the upsized image at 100% and make any necessary corrections using the Clone Tool, Healing Tool or the History Brush technique as appropriate.
