https://bugs.freedesktop.org/show_bug.cgi?id=62461

--- Comment #11 from ape <[email protected]> ---
Created attachment 76801
  --> https://bugs.freedesktop.org/attachment.cgi?id=76801&action=edit
filter's work (AOO-3.4.1 vs. LO-4.0.3)

Michael,

Apache OpenOffice-3.4.1 uses a bilinear filter to output each additional PNG
image. This is a quick filter of low quality. Therefore:
- Apache Draw opens the file with the time that is acceptable to the user;
- no messages in The Apache Bugzilla.

LibreOffice-4.x.x uses the Lanczos filter to output each additional image:
“Release Notes 3.6 >  Core: … Added Lanczos algorithm for resizing of images
and use it instead of interpolate algorithm. This change has increased the
quality of images when reducing image resolution in PDF export. fdo#46378
(Tomaž Vajngerl)”
This filter determines the transparency of the color at each point of each
additional PNG image. Therefore, the filter works slowly, but with high
quality.
I found the bug because of this.

You can compare works of filters if you look the picture in the attachment. In
the image: at the top - Apache bilinear filter; at the bottom – the Lanczos
filter (LibreOffice_4.x.x).

I think that we have needs for return to LibreOffice-3.6.5.

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