I have confirmed the bug with the provided image

When I apply the PR however media manager doesnt load successfully with browser console showing this

Uncaught SyntaxError: Unexpected token '<', "<br />
<b>"... is not valid JSON
    at JSON.parse (<anonymous>)
    at onSuccess (media-manager.min.js?70778f:20:17327)
    at n.onreadystatechange (core.min.js?2cb912:4:5125)

I have tested this item 🔴 unsuccessfully on a9af0b6

<br/>
<b>Warning</b>
:  imagecreatefrompng(): gd-png:  fatal libpng error: Read Error: truncated data in <b>D:\repos\j51\libraries\src\Image\Image.php</b>
on line <b>640</b>
<br/>
<br/>
<b>Warning</b>
:  imagecreatefrompng(): gd-png error: setjmp returns error condition in <b>D:\repos\j51\libraries\src\Image\Image.php</b>
on line <b>640</b>
<br/>
<br/>
<b>Warning</b>
:  imagecreatefrompng(): &quot;D:/repos/j51/images/ov002_03.png &quot;is not a valid PNG file in <b>D:\repos\j51\libraries\src\Image\Image.php</b>
on line <b>640</b>
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I have tested this item ✅ successfully on a9af0b6

my error was unrelated to this

The file that broke is attached as a zip so it doesnt get mangled by github

ov002_03.zip

@MacJoom Does this PR solve your issue #44417 ? If yes, please close the issue with reference to this PR. Thanks in advance.

@MacJoom Unit tests are failing:

There was 1 failure:

1) Joomla\Tests\Unit\Libraries\Cms\Image\ImageTest::testResizeTransparent
Failed asserting that false is true.

/drone/src/tests/Unit/Libraries/Cms/Image/ImageTest.php:420

I see, working on it.

I have tested this item ✅ successfully on a9af0b6

I have tested this item ✅ successfully on d4fdc54

I have tested this item ✅ successfully on d4fdc54

I have tested this item ✅ successfully on 175a39f

@MacJoom I've restored @Quy 's test result in the issue tracker which you have invalidated by a branch update. Please when you do that next time, updating a branch which has successful human tests, use the "Alter test" button in the issue tracker to restore the results. Thanks in advance.

I've also restored @brianteeman 's and @fgsw 's test result as the change after that was only for strict (typesafe) comparison, which does not cause a functional change as both of the called methods imagecolortransparent and imagecolorstotal can return only integers and so the compared variables can only be integers.

RTC

Thanks @MacJoom !