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Image transparency is lost when using Tiki File galleries

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Items
Status
Closed
Subject
Image transparency is lost when using Tiki File galleries
Version
30.x
Regression from 29.x to 30.x
Category
  • Regression
Feature
File Gallery (elFinder or standard UI)
Wiki Plugin (extends basic syntax)
Resolution status
Fixed or Solved
Submitted by
Bernard Sfez / Tiki Specialist
Volunteered to solve
Landry Bitege
Lastmod by
Bernard Sfez / Tiki Specialist
Rating
(0)
Description

Under certain condition the img plugin add image quality information that is breaking image transparency when using .png file.

On a Tiki 30 i have the following:
Image

A weird background is visible.

The plugins:


The HTML:

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<img src="dl571?display&amp;format=png&amp;quality=75" class="img-fluid text-center regImage pluginImg571 img-fluid featured " alt="Image">


If I remove "format=png" the image is displayed with the correct transparency.

It seems to come from here: lib/wiki-plugins/wikiplugin_img.php

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if (isset($imgdata['quality'])) {
                $src .= '&format=' . str_replace('image/', '', $imgdata['file']->filetype) . '&quality=' . $imgdata['quality'];
            }



Note a brand new Tiki by default (like demo.tiki.30.t.o) doesn't show the issue.
Could be file quality encoded data (on the file) or something that changed in the code.


I used the parameter "An image anywhere on the internet" and pointed to my file to fix the issue:

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{img type="src" src="display571" alt="Sovereign Offsite Backup Service" responsive="y" class="img-fluid text-center"}


Test on dev.t.o

Image

Solution
Workaround
Importance
8
Easy to solve?
3
Priority
24
Demonstrate Bug on Tiki 19+
Demonstrate Bug (older Tiki versions)
Ticket ID
8981
Created
Saturday 16 May, 2026 09:12:27 UTC
by Bernard Sfez / Tiki Specialist
LastModif
Thursday 21 May, 2026 16:18:47 UTC


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