How can I?

B
Posted By
BTinternet
Aug 21, 2004
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223
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I have a photo (for example 1000×600 pixels) I want to remove every other line of pixels and then create a new image of 1000×300. I do not wish to filter and reduce the image height by using the "Image size" command.

The reason I need to do it is to simulate TV interlace processing for some processing experiments.

I can achieve this manually by selecting every other line one by one. deleting the content and then moving parts of the image to close up the gaps up – but this would be tedious to say the least.

Any ideas?

Thanks John I
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E
edjh
Aug 21, 2004
BTInternet wrote:
I have a photo (for example 1000×600 pixels) I want to remove every other line of pixels and then create a new image of 1000×300. I do not wish to filter and reduce the image height by using the "Image size" command.
The reason I need to do it is to simulate TV interlace processing for some processing experiments.

I can achieve this manually by selecting every other line one by one. deleting the content and then moving parts of the image to close up the gaps up – but this would be tedious to say the least.

Any ideas?

Thanks John I
Filter>Sketch>Halftone Pattern using Lines. Do it on another layer or a channel and use it as the basis for a selection to erase or mask.

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M
Marsupilami
Aug 21, 2004
BTInternet wrote:
I have a photo (for example 1000×600 pixels) I want to remove every other line of pixels and then create a new image of 1000×300. I do not wish to filter and reduce the image height by using the "Image size" command.

The reason I need to do it is to simulate TV interlace processing for some processing experiments.

I can achieve this manually by selecting every other line one by one. deleting the content and then moving parts of the image to close up the gaps up – but this would be tedious to say the least.
Any ideas?

Thanks John I

Make a new layer with a pattern of a square the height of your black line a "square" transparent just below
(let’s say a new document of 50 px height and 25 px wide, with a 25×25 px black square on top,
the rest transparent all defined as a new pattern)
apply pattern on this new layer (placed on top of your blackground), and change mode to multiply.

Was it proper english?

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N
nomail
Aug 21, 2004
BTInternet wrote:

I have a photo (for example 1000×600 pixels) I want to remove every other line of pixels and then create a new image of 1000×300. I do not wish to filter and reduce the image height by using the "Image size" command.
The reason I need to do it is to simulate TV interlace processing for some processing experiments.

I can achieve this manually by selecting every other line one by one. deleting the content and then moving parts of the image to close up the gaps up – but this would be tedious to say the least.

Make an action of it. Next, make an action that records 10x the first action. Finally, make a third action that records the second action 10 times. Now you have one action that deletes 100 lines, so you only have to play this a few times to get what you want.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/

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