Hello, I need to despeckle a scan of a document consisting of black text and greyscale images. Basically I want to remove all isolated pixels, but without. Despeckle removes undesired noise—small dots or stray pixels—that may be introduced to the page during the scanning process. Images that have been. Hi folks – just came upon this board looking for some help, so here goes: I need to find a way to setup a batch process which will run the.
|Published (Last):||11 May 2004|
|PDF File Size:||14.57 Mb|
|ePub File Size:||19.48 Mb|
|Price:||Free* [*Free Regsitration Required]|
I have a photo and I scanned it, but the scanned version introduced a lot of white spots on the image. I think the problem is the type of paper of the photo, which is not smooth a bit rough. There’s something I can do? I tried a denoiser filter which didn’t make any difference. The picture itself it is ok. Viewed in a angle. If you have the negative, you will have better luck scanning it.
The issue is as you are guessing with the non-glossy finish reflecting the bright light from the scanner. If you do not have the negatives, scanning the photo in different orientations may help as this will change the direction of the reflected light. Finally, you can also try the rotation approach to create two different scans and then overlay in photoshop and then try a darken blend mode. This works well, but takes a lot more effort.
artifacts – How to remove white spots from a scanned picture? – Photography Stack Exchange
Noise reduction is more concerned on averaging to reduce image noise that appears evenly through an image. Despeckling looks for small dots that don’t fit with their surrounding area and is the appropriate filter for this kind of problem. By far the easiest answer is to use photo editing SW. I used Adobe photoshop.
Took it right out. A trick i have done to get around this is if you can find very thin, and almost see through tissue paper and put it in front of the picture as you scan it, it will cause a haze or a overexposure on despeckls type of tissue paper but it will remove any despeckl and reflection from the scanner. It appears that you have a glossy surface with a pebbled texture.
Each small bump has an individual specular reflection, a highlight.
Descreen methods for Moiré patterns
Rescan the photo with a high-count mega-pixel camera straight-on with the illumination at an angle to the photo to minimize the glare from the uneven glossy surface. Remember that a camera is a portable sespeckle behind a lens without the light source. Purchase an aerosol can of dulling spray at an art supply store and dust the surface enough to remove the highlights. Let it dry completely.
Use the absolute minimum to do the job. This is one-way for your print. There are removable types that are despeckl specifically for scanning film negatives and photographic materials; but, they are difficult to find, now. Normal removable dulling spray doesn’t dry completely and will take some care to remove completely.
A few scanning tips