Search found 35 matches

by LDAsh
2020-11-08T21:49:16-07:00
Forum: Users
Topic: [solved] Dithering from 48bit (to 24bit) image not possible?
Replies: 1
Views: 939

Re: Dithering from 48bit (to 24bit) image not possible?

Well, I've concluded that it doesn't work! However, the obvious solution to this is to split the colour channels and do the dithering separately, then combine again:- magick image24.png -resize 4096x2048 -define png:format=png48 png48:image48.png magick image48.png -blur 3x9 -depth 16 -define png:fo...
by LDAsh
2020-11-08T10:45:37-07:00
Forum: Users
Topic: [solved] Dithering from 48bit (to 24bit) image not possible?
Replies: 1
Views: 939

[solved] Dithering from 48bit (to 24bit) image not possible?

I'm certain it is, because I've done it from 16-bit greyscale to 8-bit greyscale here:- http://www.imagemagick.org/discourse-server/viewtopic.php?t=33899&sid=1e07b81d51b9812fbc9bda5dc9c07e6f magick image24.png -depth 16 -define png:format=png48 -define png:compression-level=1 -define png:compression...
by LDAsh
2019-08-29T15:34:18-07:00
Forum: Users
Topic: Is this possible? (colour + detail = colour&detail)
Replies: 5
Views: 4657

Re: Is this possible? (colour + detail = colour&detail)

Your idea sounds okay but there's a huge caveat - what if the image with the colour is lower resolution than what I want to composite over? I'd like to keep the clarity of the greyscale details but colourise it as much as I can from another image. I was thinking about what you said about splitting a...
by LDAsh
2019-08-29T06:08:39-07:00
Forum: Users
Topic: Is this possible? (colour + detail = colour&detail)
Replies: 5
Views: 4657

Re: Is this possible? (colour + detail = colour&detail)

I'd like to take the colour information from every pixel of the first image to colourise/hue-shift every pixel in the second image to get an outcome such as the third image. Where black and white wouldn't change because it's being colourised by gray, but the sky becomes blue and the shorts become re...
by LDAsh
2019-08-29T04:46:36-07:00
Forum: Users
Topic: Is this possible? (colour + detail = colour&detail)
Replies: 5
Views: 4657

Is this possible? (colour + detail = colour&detail)

I basically want to influence the hue of every pixel in one image by using another image as source information. Black and white wouldn't (can't) change, but the colourisation of all grey pixels would match that of another input to give a desired output, like in this example:- http://www.violae.net/t...
by LDAsh
2019-06-04T01:53:49-07:00
Forum: Users
Topic: Onion-skin ghost (fake motion blur)
Replies: 3
Views: 3002

Re: Onion-skin ghost (fake motion blur)

I had a couple of ideas about how to make this much better, but not sure how realistic they are, or where to even begin... First would be some way of using some histogram (or similar analysis) verbose output to determine an angle, by comparing 2 or more images and examining where the most pixels hav...
by LDAsh
2019-05-31T20:11:19-07:00
Forum: Users
Topic: Onion-skin ghost (fake motion blur)
Replies: 3
Views: 3002

Onion-skin ghost (fake motion blur)

Wondering if anyone can offer suggestions for a better approach to doing this... ("Version: ImageMagick 6.9.0-1 Q16 x86 2014-12-22") This basically takes the previous 10 frames and blends them into the current frame, stronger and stronger, to give the illusion of motion blur. It's not 'tweening' bec...
by LDAsh
2019-05-09T17:13:01-07:00
Forum: Users
Topic: 'Silhouette-bleeding' for alpha'd mipmaps
Replies: 5
Views: 3189

Re: 'Silhouette-bleeding' for alpha'd mipmaps

Ah, I found this for GIMP:- http://gimpchat.com/viewtopic.php?t=3153 Still takes about as long if not longer, and still really needs the original pasted back in. And so anyway, I got about as far as I'm going to get with this for now, if anyone is interested:- http://www.violae.net/temp/silhouette-b...
by LDAsh
2019-05-09T13:57:34-07:00
Forum: Users
Topic: 'Silhouette-bleeding' for alpha'd mipmaps
Replies: 5
Views: 3189

Re: 'Silhouette-bleeding' for alpha'd mipmaps

Thanks for the replies. I can only use miff format for some commands because I get errors on others. Maybe something to do with using 6.9. Definitely useful advice for the future, though! I was really hoping for some advice about some other approaches with morphology. Maybe there's some way of getti...
by LDAsh
2019-05-09T08:42:59-07:00
Forum: Users
Topic: 'Silhouette-bleeding' for alpha'd mipmaps
Replies: 5
Views: 3189

Re: 'Silhouette-bleeding' for alpha'd mipmaps

Here's the example:-
http://www.violae.net/temp/silhouette-bleeding.zip

I'm actually not sure how I could combine the commands, since each output from the first "BAT chunk" is used in each command in the second "chunk".
by LDAsh
2019-05-09T08:08:07-07:00
Forum: Users
Topic: 'Silhouette-bleeding' for alpha'd mipmaps
Replies: 5
Views: 3189

'Silhouette-bleeding' for alpha'd mipmaps

I've been working on a pretty convoluted script (typical of me) for doing what I call "silhouette bleeding", which essentially bleeds-out colour from the peripheries of an alpha-channel outward, so the texture can be mipped without the black "background" causing trouble at lower mip-map stages, whic...
by LDAsh
2019-02-15T17:22:31-07:00
Forum: Users
Topic: Adjusting 8bit to 'level' and compose properly into 16bit range
Replies: 6
Views: 3092

Re: Adjusting 8bit to 'level' and compose properly into 16bit range

Ugh, I was under the impression I needed to use a combination of white AND gamma, but actually I only needed white-point, which indeed works out to 800%! I did learn a lot about other ways of adjusting colours and brightness by reading and playing with everything else, at least. :P Still not sure ho...
by LDAsh
2019-02-15T10:58:17-07:00
Forum: Users
Topic: Adjusting 8bit to 'level' and compose properly into 16bit range
Replies: 6
Views: 3092

Re: Adjusting 8bit to 'level' and compose properly into 16bit range

I will look into those different approaches, but really the issue I'm having is the division itself. So far I am using "-level 0%,282.85%,0.5", which takes that 255/65536 gray and makes it just shy of 8192, according to identify. I have no idea why it's that percentage, but that's what I whittled it...
by LDAsh
2019-02-15T09:39:58-07:00
Forum: Users
Topic: Adjusting 8bit to 'level' and compose properly into 16bit range
Replies: 6
Views: 3092

Adjusting 8bit to 'level' and compose properly into 16bit range

This is more of a hypothesis looking for advice than an issue, since I'm not even sure where to begin... I'm wanting to take a heap of grayscale 8-bit images and layer them on top of each other by using 'compose add' into a 16-bit grayscale, but I want to make sure those 256 colours are a consecutiv...
by LDAsh
2019-02-11T06:31:45-07:00
Forum: Users
Topic: [SOLVED]: Resizing/Cropping based on info from another image
Replies: 2
Views: 2399

Re: Resizing/Cropping based on info from another image

Wow, too awesome. Got the resize and crop happening, and figured out how to separate the X and Y values all by myself. I guess I can just do ~unlimited values for and from whatever I want, it seems, anything I can get out of identify and into anything that can be fed a number. You've just helped me ...