![]() ![]() Now you need to get (or compile!) a 32 bit version of ImageMagick, and save your image as a 32 bit image before doing the convert. Where a.tif is your input file and r.tif is the results. This is available in the free ImageMagick command-line utility, however, it is complex, with a particularly optimal command line for downsampling being:Ĭonvert a.tif -filter Lanczos -define filter:blur=.9891028367558475 -distort Resize 20.29220779220779% r.tif Last I checked, the Lanczos algorithm gives a good balance between avoiding aliasing while maintaining crispness. Unfortunately, Photoshop doesn't offer good algorithms for doing so. The first step is to use a good resampling algorithm. However, that is likely to be much less objectionable than the moire effects.Įliminating moiré is fairly simple if you are going to make it smaller for display on the web. Of course, with such small apertures, you will probably need to use relatively longer exposures, which will mean using a tripod.īecause of the effects of diffraction, you will also see a very slight loss of sharpness as you go from f/11 to f/16 to f/22. The larger the f-number, the more completely the moire will be removed, so I suggest you try f/11, f/16 and f/22 and see which is best. I would guess that if you set the aperture to f/11 to f/16, then the diffraction blurring of the image will be sufficient to avoid obvious moire. The only totally satisfactory way of avoiding it is to reduce the resolution of the lens to less than that of the sensor. It occurs because the lens resolves more detail than the sensor is capable of handling and the result is technically known as aliasing. Moire is often impossible to remove totally in pp, so it is much better to avoid it in the first place. I will be using a Nikon D5300 for the website photo. How can I remove / minimize this issue, preferably in setting up the photo, or else afterward in Photoshop? The preliminary photo is included in this post. ![]() ![]() The tiny horizontal wood slats and their grain are creating an ugly moire effect, which we obviously don't want on images posted to our website. A project manager took a quick photo on site and emailed it in. I will be going out in a week or so to photograph. ![]() We are a woodworking firm and recently built and installed an 80'+ wall that is made up of hundred of individual horizontal strips of wood. I am an amateur photographer and take photos of work my company has done for their website. ![]()
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