Query re certain type of rasterizing

[Jaffa]

I, more or less, understand what rasterizing is, particularly for smart objects and for changing vector images.  However, I have just been watching a YouTube video by Hubert in which he crops an

image and then rasterizes it.  Now, I belatedly learned that the area outside the crop is hidden.  So, presumably (or guessing)  rasterizing the image serves to make the crop final, in that the hidden part disappears completely?

Is that the case please?

Also, how does this relate to vector or smart images, or is it something different again?  

[v_kyr]

Quote

Rasterisation (or rasterization) is the task of taking an image described in a vector graphics format (shapes) and converting it into a raster image (a series of pixels, dots or lines, which, when displayed together, create the image which was represented via shapes).^[1][2] The rasterised image may then be displayed on a computer display, video display or printer, or stored in a bitmap file format. Rasterisation may refer to either the conversion of models into raster files, or the conversion of 2D rendering primitives such as polygons or line segments into a rasterized format.

See also Raster graphics/image.

[carl123]

3 hours ago, Jaffa said:

So, presumably (or guessing)  rasterizing the image serves to make the crop final, in that the hidden part disappears completely?

In the currently released version, (1.6), Rasterise will indeed make the crop final and discard the previously hidden parts of the image.

In the next version (1.7) there are now two rasterise options, Rasterise and Rasterise & Trim.

Rasterise & Trim is now the option that will make the crop final and discard (Trim) the previously hidden parts of the image. 

If you just select Rasterise this will no longer discard the hidden parts of the image which you can recover later (i.e. undo the crop), in part or in full, should you need to.

This new ability to Rasterise an image without Trimming it preserves the default non-destructive crop mode of the Crop Tool for those users that prefer to work as non-destructively as possible.

[Jaffa]

I have just carried out an experiment with doing a standard crop of an image.  I put a red marker first however in the area to be cropped out.

Following the crop, I extended the canvas, which showed that the information was still there.

 

The second part of the experiment was to do the crop, then I rasterized the layer.  Again I extended the canvas which clearly showed that

the part cropped out was no longer there.  

 

Thinking about it, after you crop, the history records that it is a "raster crop", so that alone should be a clear indicator. 

 

Interesting!  Though I don't think much in life will change after this   - though it does help me understand rasterizing that bit more.

Also many thanks Carl, for your informative response!

[Fixx]

On 5/29/2019 at 8:15 AM, carl123 said:

version (1.7) there are now two rasterise options, Rasterise and Rasterise & Trim.

Now if there were also plain Trim command. Current Rasterise implementation resamples pixel objects to document resolution, which is sometimes undesirable if you prefer to work as non-destructively as possible

[Jaffa]

Hi Fixx, just seen your post, somehow I managed to miss it up until now.  Am still getting used to how this all works.  However, from what you are saying it seems that in most situations it would be better to rasterize, then crop, rather than to use the "Rasterize and Trim"??  Is that correct?

[Fixx]

8 hours ago, Jaffa said:

Is that correct?

No, I would think the result is about the same. Plain Trim would keep layer object resolution as original, and my impression is that Rasterise always resamples layers to document resolution.