Is there a way to make certain color ranges transparent?

Use color thresholding to specify a color range and return a black and white image. All colors between the start and stop colors (inclusively) become white ...

2009年12月4日 — The Threshold command converts grayscale or color images to high-contrast, black-and-white images. You can specify a certain level as a ...

The thresholds range from 0 to 100% (e.g. -canny 0x1+10%+30%) with +lower-percent } < +upper-percent }. If +upper-percent } is increased but +lower- ...

2018年12月16日 — -u units ... UNITS to use for lowpt and highpt values. The choices are: percent (p) for the range 0 to 100, 8bit (8) for the range of 0 to 255 ...

2016年1月16日 — And I would like to get nearly same amount of black and white pixels. I will apply this filter to video frames, because I want to achieve a ...

2014年2月20日 — I'm trying to convert a PDF to a TIFF using Imagemagick. I would like there to be no halftoning or dots for gray in my resulting tiff. Therefore ...

2021年12月18日 — If working with IM 7, then you can use -color-threshold to threshold on a range of colors, so that your desired range becomes white and the rest ...

AdaptiveThresholdImage() selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for ...

2020年7月28日 — 1 Answer 1 ... Mark Setchell's comment is correct. Maigck::Image.threshold 's argument must be scaled by the QuantumRange (provided by a C macro ...

-range-threshold low-black, low-white, high-white, high-black, perform either ... force all pixels above the threshold into white. -word-break type, sets ...