Requested Higher resolution in Custom Ratio.

[jh443]

I know I would be asking too much to have 5:8 to be included among the "standard" ratios listed... but if you could PLEASE allow Irfanview to resolve to three decimal places instead of just two, that would be great. "0.62" and "0.63" can miss the mark by several dozen pixels.

Just for "filler information:" What I am doing is preparing "Portrait" oriented images to be joined and used as wallpaper (which is "Landscape" orientation) on my 1280 x 1024 (5:4) desktop. Some of these portrait images can simply be cropped to 5:4 and not lose much, but many cannot. In these cases I wish to crop to 5:8 and join two of them to achieve 5:4.

Edit: Nevermind... I just noticed the 10:16 setting. Don't you guys know how to reduce fractions?? LOL!

Re-Edit: But still... I wouldn't be surprised if, in these days of high megapixel images, others could benefit from a triple digit save of Custom Ratio.

[Sjef]

While dragging any selection (Shift»C) with the mouse, IrfanView shows the measurements of the selection on the titel bar and the region can be replaced with the right mouse button. So what more do we want?

[Mij]

You cannot generally set an exact 3 decimal place accuracy for the ratio anyway. You can only set the sides to a precision of 1 pixel when the image is displayed at 100% zoom, and there will usually be a further rounding error in calculating the ratio. After you have used the 10:16 setting in the Custom Selection box take a look at that ratio figure at the top of the screen and see what accuracy you actually got.

If I wanted to set an exact ratio of say 5:8.42, I could set width to 500 and height to 842 pixels in the Custom Selection and apply that to an image at 100% zoom. Right click and drag to move the selection around, as Sjef suggests, and left click and drag a corner with Ctrl pressed to resize at a constant ratio. To get say 5:8.423 ratio I would have to set width 5000 and height 8423 and apply that to an image at 100% zoom. Do you begin to see the limitations?

[jh443]

Yes, I am aware of the inherent inaccuracy in making a selection. Those few pixels don't matter to me. However, it should first calculate the mathematic result, then find the closest match - the way it always does for every preprogrammed ratio.

The example given - specifying a custom ratio of 0.625 versus selecting the preset 10:16 ratio. There's a BIG difference between the two when you examine the crop area created. Sure, the 10:16 usually isn't exactly 10 x 16, but it's a heck of a lot closer than the 0.62 or 0.63 that the custom ratio forces upon the user.

But you did answer one question I've been meaning to ask: Is there any way to resize the Custom Crop while maintaining the aspect ratio.

[Skippybox]

Is there any way to resize the Custom Crop while maintaining the aspect ratio.

It tells you right in the dialog!

[Mij]

Yes, I am aware of the inherent inaccuracy in making a selection.

My point really was that the crop works in pixels. They are exact. Setting ratios to 3 decimals will usually result in a small error and I can foresee all those Bug reports saying "I applied a ratio of 0.625 and the display said 0.623".
If you want that degree of precision then I think you should work in pixels.
Work at 100% zoom so that the lines on the screen correspond exactly to pixels of the image. Set 0.62 ratio if you do not want to do the sums and Apply. Then scroll to one corner of the selection box and drag a side until the display at the top reads as near as you can get to 0.625. That way you can decide which rows of pixels you are including and which you are leaving out.

[jh443]

It tells you right in the dialog!

I've got a Logitech G15 keyboard programmed to fill in the dialog boxes. Even though I routinely use Custom Crop, I haven't seen the dialog in a LONG time.

[jh443]

My point really was that the crop works in pixels. They are exact. Setting ratios to 3 decimals will usually result in a small error and I can foresee all those Bug reports saying "I applied a ratio of 0.625 and the display said 0.623".
If you want that degree of precision then I think you should work in pixels.
Work at 100% zoom so that the lines on the screen correspond exactly to pixels of the image. Set 0.62 ratio if you do not want to do the sums and Apply. Then scroll to one corner of the selection box and drag a side until the display at the top reads as near as you can get to 0.625. That way you can decide which rows of pixels you are including and which you are leaving out.

When I get a monitor capable of a resolution of 4288 x 2848, I might start working at 100% zoom. Of course by that time I get one of those, images will be measured in gigapixels.

I would guess that most people who have used Irfanview for any length of time for editting soon gets used to minor "errors." The 4:3, 16:9, 2:3, 9:16 and 10:16 built in ratios work to a precision greater than 2 decimal digits. They're frequently not precise, but they are as close as the Zoom setting allows. That's all I was asking of the Custom Ratio.