![]() ![]() Now, instead of resizing the label, we simply specify the new label geometry. ![]() However, don't be fooled by the new print size though it's 4cm x 6cm not 4" x 6"! Filename: sample_label.png When the density/resolution is increased to 300 ppcm, everything falls into place. % convert -density 300 sample_label_orig.png sample_label.png You can use the same filename for both input and output so it makes the changes "in place." I'm using a separate file for this example. This is supposedly the correct DPI for printing. 28 ppcm translates to 72 ppi (or 72 DPI). Since everything is metric, to convert to inches, multiply by 2.54. If we look at the resolution of the original image file ( identify -ping -verbose image.png | head) we see that it's set for a resolution of 28.35x28.35 ppcm and a print size of 42.328cm x 63.4921cm (16.66" x 25"). The other option I had was to purchase a dedicated label printer (like the Zebra or Brother printers) so I could use the high quality PDF they supplied.īelow is a more step-by-step process of how to manipulate the image to get the desired result It will take longer to process.īy doing this first and then manipulating the image, I was able to achieve a crisp and clear image at the size I needed for printing on my laser printer. The more it has, the more accurate it can be though the trade off is speed. Unfortunately, none worked well enough until I realized that the data in the image was just too "thin."īy doing nothing other than increasing the density we're essentially giving the same element (a single bar code line for example) more data points to work with when we do manipulate the image later on. ImageMagick has a lenghthy section on resizing and the different filters you can use and how they work. With a low resolution (like 72 dpi for printing) there simply isn't enough data for the algorithms to use for their calculations. The reason we have to do this is because to resize an image, it must pass through one (or more) of several filters (algorithms). ![]() Normally, it would be necessary to specify the units ( -units PixelsPerInch or -units PixelsPerCentimeter) along with density, but since PNG files only use the pixels /cm unit, it's not necessary here. % convert -density 300 inputfile.png inputfile.png The trick here is to increase the density(resolution) of the original image before doing any other processing like resizing or rotating. So, my question is, how can I resize this image so that I can retain the quality? I was under the impression that if I make an image smaller, I wouldn't lose quality however, this doesn't seem to be the case. So normally this 'short-circuit' for a no-op resize a good thing. However, many filters (even the default filters) can blur images slightly. ImageMagick v6 Examples - Resize or Scaling (General Techniques) ImageMagick v6 Examples - Blurring and Sharpening Imagesīlurry resized PNG. However, my more expensive Focus 3D reader will read it more often, but still sometimes fail. For example, I have two readers - a simple 2D Symbol bar code reader that more often than not will fail. The end result is that depending on the bar code reader it may or may not read it. I have researched this extensively, but the solutions I've found only marginally improve the sharpness of image. I have to resize it because the PNG they provide is huge! Looking at the size in Preview, it's 17x25 inches. I choose PNG since I need to rotate it as I'm using my laser printer with letter sized labels ( Avery 8127). The file that you get from eBay, USPS Click-n-Ship, or PayPal is a 4圆 inch label either in PNG or PDF.
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