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https://issues.apache.org/jira/browse/GUACAMOLE-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15744562#comment-15744562
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Michael Jumper commented on GUACAMOLE-139:
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This is not a bug - guacd will use JPEG only if WebP is not available because
WebP greatly outperforms JPEG in terms of quality vs. compression ratio. The
decision is made based on the supported image mimetypes provided by each
connected user during the handshake:
https://github.com/apache/incubator-guacamole-server/blob/701e44a0cb8035dbc7f84e0c529d3eb06880e96c/src/common/guac_surface.c#L461-L463
https://github.com/apache/incubator-guacamole-server/blob/701e44a0cb8035dbc7f84e0c529d3eb06880e96c/src/libguac/client.c#L845-L889
https://github.com/apache/incubator-guacamole-server/blob/701e44a0cb8035dbc7f84e0c529d3eb06880e96c/src/libguac/user.c#L310-L334
> guacd cannot transfer pictures as JPEG
> --------------------------------------
>
> Key: GUACAMOLE-139
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-139
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-server
> Affects Versions: 0.9.9
> Environment: Ubuntu 16.04 LTS
> Reporter: wangxh
>
> I find a problem in guacamole-common/guac_surfaca.c. When guacd judge which
> is better choice(jpeg webp png), JPEG will nerver available. JPEG's judgment
> should be in front of webp's judgment.
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