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Interactive image processing? #49

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Open
Interactive image processing?#49

Description

@thomasmansencal
thomasmansencal
opened on May 9, 2020

Hi,

I (quickly) went through the docs but besides this mention:

image

I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?

Cheers,

Thomas

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
       blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Interactive image processing? · Issue #49 · plotly/dash-canvas · GitHub
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This repository was archived by the owner on Aug 29, 2025. It is now read-only.

      
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

      Interactive image processing? #49
      Open
      Open
      Interactive image processing?#49
      Description
      @thomasmansencal
      thomasmansencal
      opened on May 9, 2020
      Hi,
      I (quickly) went through the docs but besides this mention:
      image
      I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?
      Cheers,
      Thomas
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Interactive image processing? · Issue #49 · plotly/dash-canvas · GitHub
          Skip to content
          
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

          
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

          Interactive image processing? #49
          Open
          Open
          Interactive image processing?#49
          Description
          @thomasmansencal
          thomasmansencal
          opened on May 9, 2020
          Hi,
          I (quickly) went through the docs but besides this mention:
          image
          I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?
          Cheers,
          Thomas
          Metadata
          Metadata
          Assignees
          No one assigned
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Interactive image processing? · Issue #49 · plotly/dash-canvas · GitHub
              Skip to content
              
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

              
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

              Interactive image processing? #49
              Open
              Open
              Interactive image processing?#49
              Description
              @thomasmansencal
              thomasmansencal
              opened on May 9, 2020
              Hi,
              I (quickly) went through the docs but besides this mention:
              image
              I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?
              Cheers,
              Thomas
              Metadata
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              Assignees
              No one assigned
                Labels
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                No labels
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                No type
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                  Milestone
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                  None yet
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                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Interactive image processing? · Issue #49 · plotly/dash-canvas · GitHub
                  Skip to content
                  
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                  
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                  Interactive image processing? #49
                  Open
                  Open
                  Interactive image processing?#49
                  Description
                  @thomasmansencal
                  thomasmansencal
                  opened on May 9, 2020
                  Hi,
                  I (quickly) went through the docs but besides this mention:
                  image
                  I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?
                  Cheers,
                  Thomas
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Interactive image processing? · Issue #49 · plotly/dash-canvas · GitHub
                      Skip to content
                      
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                      
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                      Interactive image processing? #49
                      Open
                      Open
                      Interactive image processing?#49
                      Description
                      @thomasmansencal
                      thomasmansencal
                      opened on May 9, 2020
                      Hi,
                      I (quickly) went through the docs but besides this mention:
                      image
                      I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?
                      Cheers,
                      Thomas
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Interactive image processing? · Issue #49 · plotly/dash-canvas · GitHub
                          Skip to content
                          
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                          
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                          Interactive image processing? #49
                          Open
                          Open
                          Interactive image processing?#49
                          Description
                          @thomasmansencal
                          thomasmansencal
                          opened on May 9, 2020
                          Hi,
                          I (quickly) went through the docs but besides this mention:
                          image
                          I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?
                          Cheers,
                          Thomas
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
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                            No type
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                            No projects
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                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
Interactive image processing? · Issue #49 · plotly/dash-canvas · GitHub
                              Skip to content
                              
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                              
This repository was archived by the owner on Aug 29, 2025. It is now read-only.

                              Interactive image processing? #49
                              Open
                              Open
                              Interactive image processing?#49
                              Description
                              @thomasmansencal
                              thomasmansencal
                              opened on May 9, 2020
                              Hi,
                              I (quickly) went through the docs but besides this mention:
                              image
                              I could not really see a way to actually update the background image interactively. Say for example I want to dynamically change its saturation according to a slider value, it does not seem possible?
                              Cheers,
                              Thomas
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                No labels
                                No labels
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions