[gdal-dev] QGIS3 - Save Map as Image dialog bug?

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[gdal-dev] QGIS3 - Save Map as Image dialog bug?

Idan Miara
Hi,

i think there is a bug in the Save Map as Image dialog in QGIS3:

the initial values that are set when you open the dialog look OK, also the calculate extent by layer work OK, but when I change the scale it changes the extent to unrealistic values, and when I change the scale back to the initial value it doesn't restore the extent value.

As there are relations between the extent, scale, resolution and image size, I suggest there will be an option to choose which parameter is effected when another parameter is changed.
for instance, when changing the scale, one of the following parameters could be changed accordingly: Image size or resolution or extent. the other parameters should be to be kept fixed.

When I tried to save a large image, I got an error that there isn't enough memory to allocate. 
Could we batch process smaller tiles in memory and stream them to disk and this way to overcome the memory limit?

Regards,
Idan.

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Re: QGIS3 - Save Map as Image dialog bug?

Even Rouault-2

Idan,

 

this should rather be reported to the QGIS bug tracker. Sounds more like an issue how it uses GDAL rather than a bug in GDAL itself.

 

Even

 

> Hi,

>

> i think there is a bug in the Save Map as Image dialog in QGIS3:

>

> the initial values that are set when you open the dialog look OK, also the

> calculate extent by layer work OK, but when I change the scale it changes

> the extent to unrealistic values, and when I change the scale back to the

> initial value it doesn't restore the extent value.

>

> As there are relations between the extent, scale, resolution and image

> size, I suggest there will be an option to choose which parameter is

> effected when another parameter is changed.

> for instance, when changing the scale, one of the following parameters

> could be changed accordingly: Image size or resolution or extent. the other

> parameters should be to be kept fixed.

>

> When I tried to save a large image, I got an error that there isn't enough

> memory to allocate.

> Could we batch process smaller tiles in memory and stream them to disk and

> this way to overcome the memory limit?

>

Regards,> Idan.

 

 

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Re: QGIS3 - Save Map as Image dialog bug?

jratike80
In reply to this post by Idan Miara
Idan Miara wrote
> Hi,
>
> i think there is a bug in the Save Map as Image dialog in QGIS3:

Did you intentially write to GDAL-devel list? I believe that
QGIS-users/developers would be a better choice.

-Jukka Rahkonen-



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Re: QGIS3 - Save Map as Image dialog bug?

Idan Miara
Yes it did sent it intentionally to this list, but I was wandering if it's more a developer-list or a user-list question.
Did you mean that I should have better post it on both lists or that there is a combined list?


On 1 March 2018 at 12:27, jratike80 <[hidden email]> wrote:
Idan Miara wrote
> Hi,
>
> i think there is a bug in the Save Map as Image dialog in QGIS3:

Did you intentially write to GDAL-devel list? I believe that
QGIS-users/developers would be a better choice.

-Jukka Rahkonen-



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Re: QGIS3 - Save Map as Image dialog bug?

jratike80
In reply to this post by Idan Miara

Hi,

 

Do not cross post. If you are rather sure that you have found a bug, as I feel in your case, I suggest to write to the developers list. If there is a chance that you perhaps did something wrong it is good to write to the users list. There are more people there than in the developers list, some user may know the answer for  you, your problem may teach something for other users, and in the ideal world the developers are also reading the users mails.

 

-Jukka Rahkonen-

Lähettäjä: Idan Miara [mailto:[hidden email]]
Lähetetty: 1. maaliskuuta 2018 12:34
Vastaanottaja: Rahkonen Jukka (MML) <[hidden email]>
Kopio: [hidden email]
Aihe: Re: [gdal-dev] QGIS3 - Save Map as Image dialog bug?

 

Yes it did sent it intentionally to this list, but I was wandering if it's more a developer-list or a user-list question.

Did you mean that I should have better post it on both lists or that there is a combined list?

 

 

On 1 March 2018 at 12:27, jratike80 <[hidden email]> wrote:

Idan Miara wrote
> Hi,
>
> i think there is a bug in the Save Map as Image dialog in QGIS3:

Did you intentially write to GDAL-devel list? I believe that
QGIS-users/developers would be a better choice.

-Jukka Rahkonen-



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