Legacy ImageMagick Discussions Archive

Suppose image is divided into 3 horizontal parts - top , middle and bottom .
My purpose is to cut the middle and then join the top to bottom .
Is there a better way then saving top and bottom separately then joining them ?

Thanks.

That works. convert -size 510x340 canvas:white blank.png convert blank.png -fill orange -draw 'circle 170,170 340,170' blank.png convert blank.png -fill 'rgba(0,0,100%,0.5)' -draw 'circle 340,170 510,170' blank.png h t t p s : / / i b b . c o / e D V Z C 9 (can't post images) Do you suggest any othe...

Here , '<color> circle' denotes circle filled with color <color> I have an image with orange circles. Now I want to draw blue circles on that image such that wherever blue overlaps with orange , i should get brown. I want to do this via command line because my aim is to study regions of overlap. Whe...

The basic formulae are: new_width = w*cos(ang) + h*sin(ang) new_height = h*cos(ang) + w*sin(ang) I think IM rounds these up to the nearest integers ("ceiling"), and adds 2. 512 * (cos15 + sin 15) = 627.06 So , I will try to find correspondence for a point in 512x512 image to its 15 degree...

The basic formulae are: new_width = w*cos(ang) + h*sin(ang) new_height = h*cos(ang) + w*sin(ang) I think IM rounds these up to the nearest integers ("ceiling"), and adds 2. 512 * (cos15 + sin 15) = 627.06 So , I will try to find correspondence for a point in 512x512 image to its 15 degree...

I am running following command

convert fp.png -rotate 15 fp-rotated-15degree.png

In this case fp.png is 512x512 (https://ibb.co/f8YvZe) while fp-rotated-15degree.png turns out to be 630x630 (https://ibb.co/dST7fK) .

I saw that rotating by multiple 90 degrees is most simple case which I have verified. But when image is rotated by any other agnle then rotated image has higher dimension than original one . In that case , what should be formula for new dimension of image ? Also , is it that I have to subtract width...

I get that a pixel in original image defined by an integer won't necessarily map to another integer coordinate . I think if image is square shape and rotation angle is 90 degrees then i will get integer coordinates . In other cases i am okay with slight error . I don't want to skew the image just si...

(Question 1)Can i say that first pixel on top left of image is regarded as 0,0 in image magick . and horizontal axis is x while vertical is y , so bottom right pixel of a 512x512 image will be (511,511)? (Question 2)Now when I run the command convert input_image.png -rotate n rotated_image.png where...

Consider an image of breadth 'b' pixel and length 'l' pixel. If this image is rotated clockwise by angle theta then coordinates of point (x,y) become (x cos theta - y sin theta , y cos theta + x sin theta). For an image where each x,y is an integer such that x belongs to {0,1,...,b-1} and y belongs ...

GeeMack wrote: ↑2018-08-20T08:04:17-07:00

manit wrote: ↑2018-08-20T07:11:35-07:00But in such cases also i have observed a white triangle in corner of image .

The command you've been using works perfectly. The sample image you provided has a 32 pixel high strip of white along the bottom edge. That's what makes the white triangle in your output.

ok .

I am beginning to think that it works as follows convert f0001_01.png -rotate -15 rotated.png Then convert rotated.png -rotate 15 -set option:leg "%[fx:512/(cos(15*(pi/180))+sin(15*(pi/180)))]" -set option:distort:viewport "%[leg]x%[leg]" \( -clone 0 -distort srt 0 \) -gravity ce...

ok . Here is the original 512x512 image -> https://ibb.co/cneSfz Then I ran this command convert f0001_01.png -rotate 15 -set option:leg "%[fx:512/(cos(15*(pi/180))+sin(15*(pi/180)))]" -set option:distort:viewport "%[leg]x%[leg]" \( -clone 0 -distort srt 0 \) -gravity center +swa...

$ file f0001_01.png f0001_01.png: PNG image data, 512 x 512, 8-bit grayscale, non-interlaced $ convert f0001_01.png -rotate 15 -set option:leg "%[fx:512/(cos(15*(pi/180))+sin(15*(pi/180)))]" -set option:distort:viewport "%[leg]x%[leg]" \( -clone 0 -distort srt 0 \) -gravity cent...

to GeeMack , $ file f0001_01.png f0001_01.png: PNG image data, 512 x 512, 8-bit grayscale, non-interlaced $ convert f0001_01.png -rotate 15 -set option:leg "%[fx:512/(cos(15*(pi/180))+sin(15*(pi/180)))]" -set option:distort:viewport "%[leg]x%[leg]" \( -clone 0 -distort srt 0 \) -...