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Changing aspect ratio

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Changing aspect ratio
Ruprecht Offline
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#1
09-01-2020, 05:04 PM
I have an image with an aspect ratio of 0.62:1 and I want to change it to 0.71:1 and live with the distortion: the image includes text so it can't be cropped.   

As a new user, I have spent what seems like hours Googling "changing aspect ratio with Gimp" and trying without success the few answers I found.  

Can anyone please walk me through a method or point me to a tutorial?  I use Windows 10 and Gimp 2.10.20.

Rgds

Ruprecht
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akn_39 Offline
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#2
09-01-2020, 05:42 PM
Ruprecht: What happens if you scale the image (Image => Scale Image), changing only the height or width, and with the Height and Width values unlinked (broken chain icon). Does that give you the effect you want?

Cheers. . .
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rich2005 Offline
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#3
09-01-2020, 06:19 PM (This post was last modified: 09-02-2020, 10:21 AM by rich2005. Edit Reason: typo )
Do not want to crop, so need to scale down width by a multiplier ?

I make that 0.62 / 0.71 = 0.8732 (87.32 %)

Use Image -> Scale Image and in the dialogue break the link between Width and Height.

Gimp can do the arithmetic for you (*0.62/0.71) screenshot https://i.imgur.com/qHnJg2G.jpg
or
Change the units to percentage and enter 82.32 87.32 Change the interpolation to NoHalo and click scale. https://i.imgur.com/sY6vXpk.jpg
Note: Gimp works in pixels so there are often rounding up/down adjustments with image pixel size.
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Ruprecht Offline
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#4
09-02-2020, 03:58 PM (This post was last modified: 09-02-2020, 04:02 PM by Ruprecht.)
(09-01-2020, 05:42 PM)akn_39 Wrote: Ruprecht: What happens if you scale the image (Image => Scale Image), changing only the height or width, and with the Height and Width values unlinked (broken chain icon). Does that give you the effect you want?

Cheers. . 
Thank you, worked a treat!
(09-01-2020, 06:19 PM)rich2005 Wrote: Do not want to crop, so need to scale down width by a multiplier ?

I make that 0.62 / 0.71 = 0.8732 (87.32 %)

Use Image -> Scale Image and in the dialogue break the link between Width and Height.

Gimp can do the arithmetic for you (*0.62/0.71)   screenshot https://i.imgur.com/qHnJg2G.jpg
or
Change the units to percentage and enter 82.32 87.32  Change the interpolation to NoHalo and click scale. https://i.imgur.com/sY6vXpk.jpg
Note: Gimp works in pixels so there are often rounding up/down adjustments with image pixel size.
Thank you, and and as simple as breaking the link.
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