| 1 |
On Thursday, 9 September 2021 14:00:50 BST Michael wrote: |
| 2 |
> On Thursday, 9 September 2021 00:25:41 BST Philip Webb wrote: |
| 3 |
> > I have cropped some .png images using Gwenview |
| 4 |
> > & the reduced versions are faded with Gwenview, but fully colored with |
| 5 |
> > Feh. |
| 6 |
> > I've tried using 'convert' to create .jpg versions, |
| 7 |
> > but while they're much smaller in Kbytes (good), |
| 8 |
> > they're also faded when viewed with Gwenview (Feh ok). |
| 9 |
> > |
| 10 |
> > Can anyone explain what has caused this ? |
| 11 |
> > Is there a way of correcting it, eg with Imagemagick ? |
| 12 |
> |
| 13 |
> Once you have converted an original raster image into a smaller (i.e. more |
| 14 |
> compressed) jpeg image you have thrown away some pixels. Post-processing |
| 15 |
> can't put these missing pixels back. |
| 16 |
> |
| 17 |
> I think the gwenview faded display phenomenon you describe here is unlikely |
| 18 |
> to be the result of your conversion, since feh displays it without any |
| 19 |
> fading. It may be caused by gwenview scaling the image to a different size, |
| 20 |
> to make it fit in the gwenview window, unlike feh which will open it in its |
| 21 |
> original size whether its full size dimensions fit in your PC monitor or |
| 22 |
> not. You can check the gwenview % reduction/increase shown at the bottom |
| 23 |
> right hand corner and change this to 100% to see if it makes any odds. |
| 24 |
> |
| 25 |
> In the gwenview settings you can select what the default 'Zoom Mode' is, if |
| 26 |
> indeed this is the cause of the faded image display. |
| 27 |
> |
| 28 |
> Another thing perhaps related could be the anti-aliasing gwenview applies to |
| 29 |
> fit the image in the window aperture and how this interacts with the image |
| 30 |
> elements and the resolution of your monitor - you should be able to check |
| 31 |
> this if you change the zoom level. |
| 32 |
> |
| 33 |
> https://photo.stackexchange.com/questions/24512/what-is-aliasing-and-anti-al |
| 34 |
> iasing |
| 35 |
> |
| 36 |
> On the same PC/monitor with the same display dimensions for an image |
| 37 |
> gwenview (with its default settings) and feh ought to produce the same |
| 38 |
> output - at least they do so here. |
| 39 |
|
| 40 |
I may have misread your OP - apologies: |
| 41 |
|
| 42 |
"... but fully *colored* with Feh." |
| 43 |
|
| 44 |
This is probably related to the colour gamut settings of gwenview. In the |
| 45 |
gwenview settings, on the Advanced tab, there are settings for "Rendering |
| 46 |
intent" and "Colour profile". Change these and see if it makes a difference. |
Archives