Rendertexture skips channels sometimes

When rendering a camera to a render texture (for a portal effect), it seems to under certain circumstances skip rendering the red channel entirely.

I cannot put my finger on why this might be happening at all. It seems to depend on the angle of the camera, as it stays color-shifted (or not) if I keep the camera in the same position/rotation.

As can be seen in the below pictures, the camera preview does in fact pick up on the full color.

If it is perhaps relevant, I am working in the URP with HDR enabled.

EDIT: Upon further investigation, it seems it can actually skip any channel, it just does red far more often. I just ran into a case where only the green channel was rendered…
It appears to be linked to being forced to render HDR color, for whatever reason?

Camera
Render Texture

python – My code changes a single RGB value by a set amount, then does the same changes over the other channels

So I have the following code, that takes an image and modifies the RGB channels one at a time. It then creates a list of 9 images with the various modified channels.

The Red channel is modified by 0.1, then by 0.5, then by 0.9. This is then applied to the Green channel then the Blue Channel.

Resulting in a list of 9 images with the same modifications, but to different channels. The code works, but I just feel like there is a lot of repetition, and this really bugs me.

#%%

from PIL import Image

# Set the file and open it
file = "Final/charlie.png"

#Create an empty list to append the images to
images = ()

#Image processing function, depending on the counter
def image_processing0(a):
    if count == 0 or count == 3 or count == 6:
        c = int(a * 0.1)
        return c
    elif count == 1 or count == 4 or count == 7:
        c = int(a * 0.5)
        return c
    elif count == 2 or count == 5 or count == 8:
        c = int(a * 0.9)
        return c

#Set the count to 0
count = 0

#Create PixelMap
while count <9:
#Creat Pic at the start of each loop
    pic = Image.open(file)
#Convert the image to RGB, so we dont have to deal with the alpha channel
    pic = pic.convert('RGB')
    
#Get the RGB value for every pixel
    for x in range(pic.size(0)):
            for y in range(pic.size(1)):

                #Split the RGB value into variables r, g and b
                r,g,b = pic.getpixel((x,y))
                
#Check the count, use logic to appy the processing to the correct channel               
                if count <3:
                    r = image_processing0(r)
                    pic.putpixel((x,y),(r,g,b))
                elif count < 6:
                    g = image_processing0(g)
                    pic.putpixel((x,y),(r,g,b))
                elif count < 9:
                    b = image_processing0(b)
                    pic.putpixel((x,y),(r,g,b))

#Add the images to the list                    
    images.append(pic)
#Increment the counter    
    count+=1  

Both my logic statement, and my function seem a bit repetitive:

 #---------------------------------------------------
    #Image processing function, depending on the counter
    def image_processing0(a):
        if count == 0 or count == 3 or count == 6:
            c = int(a * 0.1)
            return c

        elif count == 1 or count == 4 or count == 7:
            c = int(a * 0.5)
            return c

        elif count == 2 or count == 5 or count == 8:
            c = int(a * 0.9)
            return c
#---------------------------------------------------

#Check the count, use logic to apply the processing to the correct channel               
if count <3:
    r = image_processing0(r)
    pic.putpixel((x,y),(r,g,b))

elif count < 6:
    g = image_processing0(g)
    pic.putpixel((x,y),(r,g,b))

elif count < 9:
    b = image_processing0(b)
    pic.putpixel((x,y),(r,g,b))
#---------------------------------------------------

I tried to change my logic to the following, but soon realized that when I put the pixel back, i had no way to specify exactly what channel I was placing back in the pic.putpixel((x,y),(r,g,b)) statement.

if count <3:
    channel = r
elif count < 6:
    channel = g
elif count < 9:
    channel = b

channel = image_processing0(channel)
pic.putpixel((x,y),(r,g,b))    #No way to define which channel is being changed

google – Search only specific channels in youTube.com

I asked this question to answer it as I was not able to answer to a similar question(Search only subscribed channels in YouTube) as it is a highly active question and my reputation is low as I have just opened an account today. I thought it would be effective so decided to take this step.

This is one of my first answers just copy-pasted. So, please excuse the momentary dips in quality of this. Also, I am not a programmer but found this effective method through Trial-and-Error. I have put this answer on several similar questions as I do not really know if there is any reshare option.

I do not know if you got the answer already or not but this is something I found out just today.

Now, All of these require chrome extensions for pseudo-Whitelist These are the links. Use the group policy for making the extensions admin force-installed as it can seriously mess up willpower as it will feel as if it is better to uninstall the extension instead­čśů

DFTube(Optional) – https://chrome.google.com/webstore/detail/mjdepdfccjgcndkmemponafgioodelna
Channel Blocker -https://chrome.google.com/webstore/detail/nfkmalbckemmklibjddenhnofgnfcdfp
uBlackList (Optional)- https://chrome.google.com/webstore/detail/pncfbmialoiaghdehhbnbhkkgmjanfhe
Download these and go to DFTube – You can completely remove recommended tab on youtube if you wish along with others in the case it distracts you – It’s optional

Now come to the main one – Number 2 Channel blocker – In this, Click the Options of this extension after installing it. Click the “Advanced View” option then in the dropdown menu, select “Block Users/Channels by Name” and then in the box write all letters individually from A to Z. such that in the block list it shows all letters of the alphabet(like “a” *,”b” *, “c” * on each line and so on) IMPORTANT: BEFORE DOING THIS, Write a list of all the youtube channels you only want in your recommended or even your youtube search results. Now once you get only the list of youtube channels you want, then click the dropdown menu again and click the option asking ” Exclude these users/Channels” and write the TITLES of these channels down individually with PROPER SPACES IN PLACE.

Now scroll a bit down in the extensions options and in the “VISIBILITY” option turn the “Block-animation speed” to “fast” by dragging it towards “fast”.

Now whenever you shall try to access any channel other than the one you explicitly put in the exclude section WITH PROPER SECTIONS, then all the other videos shall be block very fast – including the channels and users (Except Channels/Users with Language characters other than English like Japanese and Chinese)

As for blacklist – Again it is optional as it will remove youtube search results from google.com, bing.com, and other engines. If you are ready for it – Here it is:- Just after installing the extension search up youtube – You will find a “Block this site” button appearing which you can press to block any website (youtube in this case). Now AFTER THIS IS DONE go to the extension options for uBlacklist – Find the option “Hide the number of blocked sites and the “Show” link” and turn it on. If you use search engines other than google – enable all of them just above the option which I mentioned. So in case you want to search a particular channel – it shall be searchable only on youtube.com and no other engines.

Now, All of these will work together and put only certain websites on your recommended/search feed and block all channels except the ones in the “Exclude List”. Now, if you are putting these off for distractions – Use a tough blocker like Cold Turkey or FocusMe to block the option to change the extension’s options by putting the extension ids in blocking urls by keywords option.

Boom! Youtube now blocks rest of the channels very fast and also blocks Every user/channel other than ones you see alone and you can get some serious-serious bang-your-head-on-the-wall productivity­čśé­čĄú

If all of these don’t work just use another extension like Blocksite or Stayfocusd to block the urls you do not want !

search – Youtube videos from verified channels only

I would imagine for many youtube users like me, it is a common nuisance to sift through youtube’s vast content to find the videos uploaded by verified sources (channels). I wonder if there is a way to disable unverified sources. I hoped to see an option within youtube’s settings to restrict to the content from verified sources. But I couldn’t find anything like that.
Please let me know if there is any solution for this.

go – Breadth first search of a binary-tree with channels

As an exercise in using channels in Go I implemented a breadth-first traversal of a binary tree, using a channel as a queue to store the order of the nodes to traverse. After ironing out a bunch of bugs related to all goroutines sleeping I ended up with this code:

package main

import "fmt"

type Node struct {
    Value int
    Left  *Node
    Right *Node
}

var tree *Node

func init() {
    tree = &Node{1, &Node{2, &Node{4, &Node{6, nil, nil}, nil}, &Node{5, nil, &Node{7, nil, nil}}}, &Node{3, nil, nil}}
}

func (t *Node) BFS() {
    c := make(chan *Node, 512)
    c <- t
    bfs(c)
    close(c)
}

func bfs(c chan *Node) {
    empty := false
    for {
        select {
        case next := <-c:
            if next != nil {
                c <- next.Left
                c <- next.Right
                fmt.Println(next.Value)
            }
        default:
            empty = true
        }
        if empty {
            break
        }
    }
}

func main() {
    tree.BFS()
}

While I appreciate advice on any part of the code, I am specifically concerned about the tight for loop in the body of bfs(), the not particularly safe-for-concurrency code and other possible issues mentioned in this question on stackoverflow.

Free Software to Control CMYK Channels

Hi All,

First time post.
SEMrush

I’ve got a printer that is customized to accommodate ceramic inks. What I need to find is some software that I can use to control the CMYK channels for my prints, to optimize the ink mix.

I know you can do this in photoshop, but we would need to install it on several machines and it would be better if there is a free alternative. Does anyone have any ideas?

Thanks.

 

multithreading – Parallelized web crawler using goroutines and channels

As part of the “a tour of Go” section on golang.org, I was trying to make a (formerly singlethreaded) web crawler parallelized using goroutines. I got it working but it doesn’t seem to “flow” right; there’s a bunch of duplicated code. Looking for advice as to how it can seem a bit more Go-literate.

package main

import (
    "fmt"
    "sync"
)

type Fetcher interface {
    // Fetch returns the body of URL and
    // a slice of URLs found on that page.
    Fetch(url string) (body string, urls ()string, err error)
}

type safeMap = struct {
    seen map(string)bool
    mu sync.Mutex
    remaining int
}

// Crawl uses fetcher to recursively crawl
// pages starting with url, to a maximum of depth.

func gci(url string, depth int, fetcher Fetcher, m *safeMap, fc chan string) {
    go crawl_int(url, depth, fetcher, m, fc)
}

func crawl_int(url string, depth int, fetcher Fetcher, m* safeMap, fc chan string) {
    if depth > 0 {
        body, urls, err := fetcher.Fetch(url)
        //fc <- fmt.Sprintf("Crawling %sn", url)
        m.mu.Lock()
        defer m.mu.Unlock()

        if err != nil {
            fc <- fmt.Sprintf("%vn",err)
        } else {
            fc <- fmt.Sprintf("found: %s %q %dn", url, body, len(urls))
            for _, u := range urls {
                _, found := m.seen(u)
                if !found {
                    m.remaining += 1
                    m.seen(u) = true
                    defer gci(u, depth-1, fetcher, m, fc)
                }
            }
        }
    } else {
        m.mu.Lock()
        defer m.mu.Unlock()
    }       
    m.remaining -= 1
    //fc <- fmt.Sprintf("finished %s remaining to %dn", url, m.remaining)
    if (m.remaining == 0) {
        //fc <- fmt.Sprintf("closing")
        close(fc)
    }
}   

func Crawl(url string, depth int, fetcher Fetcher, ch chan string) {
    // Fetches URLs in parallel.
    // Doesn't fetch the same URL twice.
    c := safeMap{seen: make(map(string)bool), remaining: 1}

    go crawl_int(url, depth, fetcher, &c, ch)
}

func main() {
    ch := make(chan string,5)
    Crawl("https://golang.org/", 4, fetcher, ch)
    for u := range ch {
        fmt.Print(u)
    }
}

// fakeFetcher is Fetcher that returns canned results.
type fakeFetcher map(string)*fakeResult

type fakeResult struct {
    body string
    urls ()string
}

func (f fakeFetcher) Fetch(url string) (string, ()string, error) {
    if res, ok := f(url); ok {
        return res.body, res.urls, nil
    }
    return "", nil, fmt.Errorf("not found: %s", url)
}

// fetcher is a populated fakeFetcher.
var fetcher = fakeFetcher{
    "https://golang.org/": &fakeResult{
        "The Go Programming Language",
        ()string{
            "https://golang.org/pkg/",
            "https://golang.org/cmd/",
        },
    },
    "https://golang.org/pkg/": &fakeResult{
        "Packages",
        ()string{
            "https://golang.org/",
            "https://golang.org/cmd/",
            "https://golang.org/pkg/fmt/",
            "https://golang.org/pkg/os/",
        },
    },
    "https://golang.org/pkg/fmt/": &fakeResult{
        "Package fmt",
        ()string{
            "https://golang.org/",
            "https://golang.org/pkg/",
        },
    },
    "https://golang.org/pkg/os/": &fakeResult{
        "Package os",
        ()string{
            "https://golang.org/",
            "https://golang.org/pkg/",
        },
    },
}

Is there any way to organize Slack channels for everyone?

We are using Slack as our community “hub”, instead of a more traditional forum. This is primarily because there is a significant barrier to entry when someone has to click “New Topic” and then present a structured, formal topic for discussion. In Slack they just jump in and talk, which is great for engagement.

But there is a real problem with organization. Over time we have grown and the number of channels is getting out of hand. Currently we have 55 channels which should be divided into roughly a half doze top-level groupings/categories. Except Slack only allows for that at the per-user level.

Is there any way for us as administrators, to organize the channels into any sort of hierarchy at all? So far my efforts to find a solution have come up empty but I’m hoping maybe someone here has some ideas.

sound – Subtracting audio channels

Is there a function that takes right channel of audio and combines it with inverted left channel of audio?
Do not confuse inverted with reversed.

The following does not work since it does not allow negative arguments.

AudioChannelMix[someaudio, {"Mono", {1, -1}}]

AudioChannelCombine is also of no use.

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