Blur question

I’m seeking the proper name for the following technique and, when possible, a description how you would do this.
Imagine a diagonal line on a photo. This image must be enlarged. Ideal (I think) should be an enlargement precisely 2x, so each pixel becomes 4 pixels. Than, with a (the name I’m looking for) blur filter, the gaps within the enlargement should be filled.
When / if the size still is to small, I could do that again, until oversized.

I know many filters or professional programmes were written, to do this for us, but I’m still on PhotoShop 4 and I feel no need to invest.
Are there free filters for PhotoShop to do this job?

Bowler wrote:

I’m seeking the proper name for the following technique and, when

a description how you would do this.
Imagine a diagonal line on a photo. This image must be enlarged. Ideal (I think) should be an enlargement precisely 2x, so each pixel

4 pixels. Than, with a (the name I’m looking for) blur filter, the gaps within the enlargement should be filled.
When / if the size still is to small, I could do that again, until oversized.

I know many filters or professional programmes were written, to do this

us, but I’m still on PhotoShop 4 and I feel no need to invest.
Are there free filters for PhotoShop to do this job?

If I understand you correctly, you want to resize the picture and think that Photoshop cannot do that already? What you describe is called ‘interpolation’ (filling the gaps) and Photoshop automatically does that during the resize. Use ‘bicubic’ for the best results.

If I understand you correctly, you want to resize the picture and think that Photoshop cannot do that already? What you describe is called ‘interpolation’ (filling the gaps) and Photoshop automatically does that during the resize. Use ‘bicubic’ for the best results.

Yes, you’ll understood me very well, Johan. Next question: can’t I switch this interpolation function off?

Hi y’all,

I’m seeking the proper name for the following technique and, when

a description how you would do this.
Imagine a diagonal line on a photo. This image must be enlarged. Ideal (I think) should be an enlargement precisely 2x, so each pixel

4 pixels. Than, with a (the name I’m looking for) blur filter, the gaps within the enlargement should be filled.
When / if the size still is to small, I could do that again, until oversized.

I know many filters or professional programmes were written, to do this

us, but I’m still on PhotoShop 4 and I feel no need to invest.
Are there free filters for PhotoShop to do this job?

Hope to read you,
TIA

Frans

if you have a lifetime and a half to spare try googling on digital image interpolation

Be warned though – its math, a bit of linear and non-linear and discrete cosine functions etcetera and so forth

good stuff for sure but a lot ranging from beginner to post grad to

papers

Arts

"Arty Phacting" wrote…

if you have a lifetime and a half to spare try googling on digital image interpolation

Be warned though – its math, a bit of linear and non-linear and discrete cosine functions etcetera and so forth

good stuff for sure but a lot ranging from beginner to post grad to

research

papers

Arts

Thank you Arts, I’ll give this a try

Frans