problem regarding HDP

[hellside]

I am using PSPX6
for example, there is a BMP which is 2.25mb
if I use "save it as a new file", and chose lossless HDP, then I get a file 537k
if I use "batch action" and save this file as lossless HDP, then I get a file 1.2mb

Please check why this happens. Thanks.

[canuck]

Please list step-by-step what you are doing so that we can duplicate what you are doing.

[hellside]

save as

batch

result

hellside3.png (6.53 KiB) Viewed 4607 times

Please see the attachment.

[LeviFiction]

Hellside, have you tried setting them both to lossy with a compression of 10?

Maybe PSP isn't saving them lossless.

[canuck]

I am using PSPX6
for example, there is a BMP which is 2.25mb
if I use "save it as a new file", and chose lossless HDP, then I get a file 537k
if I use "batch action" and save this file as lossless HDP, then I get a file 1.2mb

Please check why this happens. Thanks.

I cannot duplicate your findings using PSP X6

"lossless" setting

aTest.jpg (10.05 KiB) Viewed 4582 times

[hartpaul]

I took a jpg saved it as a bmp file. Then went to X4 and did a Save as lossless and batch save lossless. Repeated with X6 . Results show no difference in either version.

[hellside]

after countless try, I think I find the cause.
the lossless is not really lossless, it is affected by the grey out option!

transfering a bmp 2.25mb using the two lossless set
I get one file 1151k and the other.....18k(of course it looks totally lossy)

please try this method

curious though, the output of lossy1 is 1365k and lossy99 is 19k, both larger than their corresponding "lossless" version
but lossy10 result is smaller than its corresponding "lossless" version

[canuck]

Yes, it seems that the setting of the compression factor is also applied to the "lossless" method. So it doesn't matter if you use the lossless or lossy method, the important parameter is the compression factor setting.

[hellside]

Yes, it seems that the setting of the compression factor is also applied to the "lossless" method. So it doesn't matter if you use the lossless or lossy method, the important parameter is the compression factor setting.

is there a way to get a lossless HDP? since the lossy setting can't be 0.
and I also notice the transparency is not kept in HDP, though HDP support transparency.

[hellside]

I downloaded a plugin so photoshop support HDP
the real lossless HDP is in fact not much smaller than PNG...a 2.25mb BMP can be trans into a 1.30mb HDP