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Transparency in a TIFF file


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We need to have an Affinity Document with a Transparent background set up in order to Export a TIFF with transparency. If I open your tutor growth file it shows transparency and if I place it in a Photo Document with a transparent background (check the transparency box in the New dialog) I can then export it as a TIFF with Transparency (using the 16bit PNG preset), If I place your file in a Photo document without transparency then I cannot export it with transparency.

Mac Pro (Late 2013) Mac OS 12.7.2 
Affinity Designer 2.3.1 | Affinity Photo 2.3.1 | Affinity Publisher 2.3.1 | Beta versions as they appear.

I have never mastered color management, period, so I cannot help with that.

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15 minutes ago, fabiano.cudazzo said:

Transparency in a TIFF file

Confirmed. V1 opens them showing the transparency. Placing this file in V2 gives no problem.

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Windows 10 / 11, Complete Suite Retail and Beta

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A TIFF file can have transparency both straight (unassociated alpha) and premultiplied (associated alpha). Affinity apps v1 would open both kinds of transparencies and make the former kinds of images to associated alpha transparencies without an alpha channel, while version 2 apps do not (they still place both kinds of images similarly, "as (normally) expected", applying the transparency)

I am not sure but I suppose this is a deliberate change and can be useful in certain scenarios. The following clip shows how the unassociated alpha can be loaded to image alpha in Photo 2 (and thus "restore" version 1 behavior):

 

 

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  • 5 months later...
On 12/1/2022 at 12:13 PM, lacerto said:

A TIFF file can have transparency both straight (unassociated alpha) and premultiplied (associated alpha). Affinity apps v1 would open both kinds of transparencies and make the former kinds of images to associated alpha transparencies without an alpha channel, while version 2 apps do not (they still place both kinds of images similarly, "as (normally) expected", applying the transparency)

I am not sure but I suppose this is a deliberate change and can be useful in certain scenarios. The following clip shows how the unassociated alpha can be loaded to image alpha in Photo 2 (and thus "restore" version 1 behavior):

Edit: Another user in that other thread pointed out my mistakes in trying to use your approach:

  1. I didn't have the Background layer selected.
  2. A right-click is required.

So, I no longer have a question for you, @lacerto.

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There's a TIFF file in the first post of the topic I've linked to below that seems to have a problem related to an unassociated alpha channel.

But when I try what you showed in your video I don't get the same popup choices you got when I click on that channel. Your video is from 2.0, I think. Has something changed in 2.1, perhaps?  Thanks.

 

-- Walt
Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases
PC:
    Desktop:  Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 

    Laptop:  Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU.
iPad:  iPad Pro M1, 12.9": iPadOS 17.3, Apple Pencil 2, Magic Keyboard 
Mac:  2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.3.1

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