SageThumbs / Tickets / #74 TIFF Thumbnails - very loose quality in Windows Explorer

raspopov - 2014-02-25

Can I have a sample tiff-file and its screenshots in versions 17 and 18?
(attach as zip or sent via e-mail please)

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codemaster92 - 2014-02-26

The test file is a simple screenshot saved as TIFF with Microsoft Paint.
The screenshot v2.0.0.17.jpg was taken with an installed SageThumbs 2.0.0.17.
The screenshot v2.0.0.18.jpg was taken after installing version 2.0.0.18 over the previous version, rebooting (the installer asked for it) and clearing the thumbnail cache in the SageThumbs options panel.

ticket74.zip

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raspopov - 2014-02-26

SageThumbs creates thumbnail with 256x256 maximum size and Windows Explorer shows this also 256x256 in right preview panel as-is... But how you managed to enlarge this preview?!

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codemaster92 - 2014-02-26

You can size the right preview panel as you want. This is very practical on widescreen monitors for image preview directly in Windows Explorer, but the required resolutions are much higher than 256x256. This was perfectly possible in version 2.0.0.17.

I found out that Windows Explorer is using the registered IThumbnailProvider associated with a given filetype for preview image retrieval, which SageThumbs implements.
I managed to instantiate a SageThumbs COM object and call the GetThumbnail method of the IThumbnailProvider Interface directly. With version 2.0.0.17 I get whatever size I specify for the [in] UINT cx parameter. With version 2.0.0.18 I always get resolutions around 256x256 independently of the parameter. Are there any plans to change this behaviour again?

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raspopov - 2014-02-27

Please try this version: https://dl.dropboxusercontent.com/u/26349167/sagethumbs_2.0.0.19_setup.exe

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raspopov - 2014-02-27

status: New --> Started

assigned_to: raspopov

Milestone: 2.0.0.18 --> 2.0.0.19
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Anonymous - 2014-03-06

The attachment shows my SageThumbs 2.0.0.19 (same as for 2.0.0.18) settings, the original pic on the left, and the Windows Preview pane on the right, immediately after turning on "Prefer Image embedded thumbnails". When that setting is turned off again, the Windows Preview Pane then works again as normal. Clearing the icon cache didn't help.

blocky.jpg

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Anonymous - 2014-03-06

Other Details:
SageThumbs 2.0.0.18 & 2.0.0.19 (same problem with both)
Windows 7 x64

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raspopov - 2014-03-07

Fixed. Re-download 2.0.0.19, re-install it (by removing old version) and test again please.

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raspopov - 2014-03-15

status: Started --> Fixed
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- Anonymous - 2014-04-09
  
  Hello Raspopov,
  
  Finally I have time to thank you for the fix. Also a complicating factor in testing when I was using your extension was that I found out that Gimp only displays the top graphics layer of the image in the xcf file in its preview files (bug that they don’t have time to fix), at the time I thought that was a bug with your utility.
  
  regards,
  Mark
  
  From: raspopov
  Sent: Saturday, March 15, 2014 11:34 PM
  To: [sagethumbs:tickets]
  Subject: [sagethumbs:tickets] #74 TIFF Thumbnails - very loose quality in Windows Explorer
  
  a.. status: Started --> Fixed
  
  [tickets:#74] TIFF Thumbnails - very loose quality in Windows Explorer
  
  Status: Fixed
  Milestone: 2.0.0.19
  Created: Tue Feb 25, 2014 01:13 PM UTC by codemaster92
  Last Updated: Fri Mar 07, 2014 04:42 PM UTC
  Owner: raspopov
  
  What steps will reproduce the problem?
  
  1.. Install version 2.0.0.18
  2.. Select any TIFF image in Windows Explorer
  3.. Look at the preview window at the right side (make sure that is enabled and increase its size)
  What is the expected output? What do you see instead?
  
  1.. Expected: Preview image in adequate quality
  2.. Instead: Preview image in very poor quality and very low resolution
  What version of the product are you using? On what operating system?
  
  SageThumbs 2.0.0.18
  Windows 7 x64
  
  Please provide any additional information below.
  
  Reverted to 2.0.0.17 and the problem is gone, when I install 2.0.0.18 again, it is the same again
  
  Sent from sourceforge.net because you indicated interest in https://sourceforge.net/p/sagethumbs/tickets/74/
  
  To unsubscribe from further messages, please visit https://sourceforge.net/auth/subscriptions/
  
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TIFF Thumbnails - very loose quality in Windows Explorer

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#74 TIFF Thumbnails - very loose quality in Windows Explorer

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