Bug 424057

Summary:	Fade effect is blackish instead or real fade
Product:	[Applications] kdenlive	Reporter:	Bimal Rekhadiya <bimaljr>
Component:	Video Effects & Transitions	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	fritzibaby, snd.noise
Priority:	NOR	Flags:	fritzibaby: timeline_corruption+
Version First Reported In:	20.04.1
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	This is background image This is transparent PNG image - Firefox logo FadeIn_transform

Description Bimal Rekhadiya 2020-07-10 07:57:58 UTC

Hello,

I added two images. One is background white image and second is transparent PNG image. I applied fade-in effect in transparent PNG image. But the fade-in effect is not pure trasparent and blackish at starting of fade effect. This same effect is working perfectly with Openshop. I compared same with OpenShot and it's working perfectly. So I created a video to give you preview:
https://streamable.com/e159ke

I also tried with different PNG images but the problem still exists.

STEPS TO REPRODUCE:
1. Add a background white image.
2. Add a PNG transparent effect and apply fade-in effect
3. Now see the starting frame of the fade-in effect. It will be blackish instead of pure opacity. See this video https://streamable.com/e159ke

OBSERVED RESULT:
I think the opacity engine is not working properly.

EXPECTED RESULT:
I added Openshot demo too in the video and you can see it what I am expecting.

SOFTWARE/OS VERSIONS
Kdenlive version: 20.04.1
Linux/KDE Plasma: Kubuntu 20.04
(available in About System)
KDE Plasma Version: Not sure but latest in Kubuntu 12.04
KDE Frameworks Version: 5.68
Qt Version: 5.12.8

ADDITIONAL INFORMATION
I tried Kdenlive version which comes apt-get command. I think the bug appear due to old version. So I updated Kdenlive with PPA on Ubuntu:
https://launchpad.net/~kdenlive/+archive/ubuntu/kdenlive-stable
But still problem exists.

Comment 1 emohr 2020-07-18 13:42:39 UTC

Please try with the current Kdenlive AppImage version 20.04.1b to see if there are any packaging issues https://files.kde.org/kdenlive/release/ 

If the problem/issue doesn't occur when using the AppImage, then it's your configuration or packaging.

Comment 2 Bimal Rekhadiya 2020-07-22 18:36:20 UTC

Hello

Yes I tried with  kdenlive-20.04.2c-x86_64.appimage version (current latest version) and still same problem exits. The problem is exactly same and no difference.

Comment 3 emohr 2020-07-22 19:25:39 UTC

I see your point. Could you upload here both pictures the unsplash-bg.jpg and the logo-2.png so I can make a test.

Comment 4 Bimal Rekhadiya 2020-07-23 16:49:13 UTC

Created attachment 130338 [details]
This is background image

Comment 5 Bimal Rekhadiya 2020-07-23 16:49:55 UTC

Created attachment 130339 [details]
This is transparent PNG image - Firefox logo

Comment 6 Bimal Rekhadiya 2020-07-23 16:52:33 UTC

Ye sure. Here I attached both images.

The first is background image which I downloaded from Freepik site. Here is the image link (just for reference):
https://www.freepik.com/free-vector/elegant-white-background-with-shiny-lines_4077186.htm#page=1&query=white%20background&position=1

The second image is Forefox logo. The forground image is Firefox logo and technically it's transparent PNG image. You can use any transparent PNG image.

Comment 7 emohr 2020-07-23 18:10:59 UTC

Created attachment 130342 [details]
FadeIn_transform

I confirm this behavior. I assume you expect a fade in like transform does it (see attached screengrab). Correct? If so, fade seems not working with opacity but with a gray filter.

Comment 8 emohr 2020-07-23 18:14:12 UTC

Change to confirmed.

Comment 9 Bimal Rekhadiya 2020-07-24 04:44:54 UTC

"I assume you expect a fade in like transform does it (see attached screengrab). Correct? If so, fade seems not working with opacity but with a gray filter."
-- Yes right. This exactly I am feeling that the opacity is not working as expected and looks like grey filter used. 

Also this same happens to "Title Clip" too. Like when I add a new "Title Clip" (text layer) with opacity effect than the same black opacity applied to "Title Clip". I request you to solve on "Title Clip" too.

Comment 10 farid 2021-03-07 21:02:01 UTC

There is no bug really. Fade in and out effects they fade from and to black. For what you want you must use a transition.